IIIF Manifest that models the use case of a transcript file not convertible to webAnnotations for lack of time codes.

Transcript file in Rendering link

{
  "@context": [
    "http://www.w3.org/ns/anno.jsonld",
    "http://iiif.io/api/presentation/3/context.json"
  ],
  "type": "Manifest",
  "id": "https://spruce.dlib.indiana.edu/media_objects/9593tv280/manifest",
  "label": {
    "@none": [
      "Multi-section Item"
    ]
  },
  "metadata": [
    {
      "label": {
        "@none": [
          "Title"
        ]
      },
      "value": {
        "@none": [
          "Multi-section Item"
        ]
      }
    },
    {
      "label": {
        "@none": [
          "Date Issued"
        ]
      },
      "value": {
        "@none": [
          "2019"
        ]
      }
    }
  ],
  "rendering": [
    {
      "id": "https://path/to/my/transcript.txt",
      "type": "Text",
      "label": {
        "en": [
          "Transcript"
        ]
      },
      "format": "text/txt"
    }
  ],
  "homepage": {
    "id": "https://spruce.dlib.indiana.edu/media_objects/9593tv280",
    "type": "Text",
    "label": {
      "@none": [
        "View in Repository"
      ]
    },
    "format": "text/html"
  },
  "items": [
    {
      "type": "Canvas",
      "id": "https://spruce.dlib.indiana.edu/media_objects/9593tv280/manifest/canvas/c821gj948",
      "items": [
        {
          "type": "AnnotationPage",
          "id": "https://spruce.dlib.indiana.edu/media_objects/9593tv280/manifest/canvas/c821gj948/annotation_page/100a06f8-3938-4cc3-8546-b5744b6fc59e",
          "items": [
            {
              "type": "Annotation",
              "motivation": "painting",
              "target": "https://spruce.dlib.indiana.edu/media_objects/9593tv280/manifest/canvas/c821gj948",
              "body": {
                "type": "Choice",
                "choiceHint": "user",
                "items": [
                  {
                    "id": "https://spruce.dlib.indiana.edu/master_files/c821gj948/auto.m3u8",
                    "type": "Sound",
                    "duration": 397.531,
                    "label": {
                      "@none": [
                        "auto"
                      ]
                    },
                    "service": [
                      {
                        "context": "http://iiif.io/api/auth/1/context.json",
                        "@id": "https://spruce.dlib.indiana.edu/users/sign_in?login_popup=1",
                        "@type": "AuthCookieService1",
                        "confirmLabel": "Login",
                        "description": "Avalon Application requires that you log in with your account to view this content.",
                        "failureDescription": "\\u003ca href=\"http://example.org/policy\"\\u003eAccess Policy\\u003c/a\\u003e",
                        "failureHeader": "Authentication Failed",
                        "header": "Please Log In",
                        "label": "Login Required",
                        "profile": "http://iiif.io/api/auth/1/login",
                        "service": [
                          {
                            "@id": "https://spruce.dlib.indiana.edu/master_files/c821gj948/auto.m3u8",
                            "@type": "AuthProbeService1",
                            "profile": "http://iiif.io/api/auth/1/probe"
                          },
                          {
                            "@id": "https://spruce.dlib.indiana.edu/iiif_auth_token/c821gj948",
                            "@type": "AuthTokenService1",
                            "profile": "http://iiif.io/api/auth/1/token"
                          },
                          {
                            "@id": "https://spruce.dlib.indiana.edu/users/sign_out",
                            "@type": "AuthLogoutService1",
                            "label": "Log out",
                            "profile": "http://iiif.io/api/auth/1/logout"
                          }
                        ]
                      }
                    ]
                  },
                  {
                    "id": "https://spruce.dlib.indiana.edu/master_files/c821gj948/high.m3u8",
                    "type": "Sound",
                    "duration": 397.531,
                    "label": {
                      "@none": [
                        "high"
                      ]
                    },
                    "service": [
                      {
                        "context": "http://iiif.io/api/auth/1/context.json",
                        "@id": "https://spruce.dlib.indiana.edu/users/sign_in?login_popup=1",
                        "@type": "AuthCookieService1",
                        "confirmLabel": "Login",
                        "description": "Avalon Application requires that you log in with your account to view this content.",
                        "failureDescription": "\\u003ca href=\"http://example.org/policy\"\\u003eAccess Policy\\u003c/a\\u003e",
                        "failureHeader": "Authentication Failed",
                        "header": "Please Log In",
                        "label": "Login Required",
                        "profile": "http://iiif.io/api/auth/1/login",
                        "service": [
                          {
                            "@id": "https://spruce.dlib.indiana.edu/master_files/c821gj948/high.m3u8",
                            "@type": "AuthProbeService1",
                            "profile": "http://iiif.io/api/auth/1/probe"
                          },
                          {
                            "@id": "https://spruce.dlib.indiana.edu/iiif_auth_token/c821gj948",
                            "@type": "AuthTokenService1",
                            "profile": "http://iiif.io/api/auth/1/token"
                          },
                          {
                            "@id": "https://spruce.dlib.indiana.edu/users/sign_out",
                            "@type": "AuthLogoutService1",
                            "label": "Log out",
                            "profile": "http://iiif.io/api/auth/1/logout"
                          }
                        ]
                      }
                    ]
                  },
                  {
                    "id": "https://spruce.dlib.indiana.edu/master_files/c821gj948/medium.m3u8",
                    "type": "Sound",
                    "duration": 397.531,
                    "label": {
                      "@none": [
                        "medium"
                      ]
                    },
                    "service": [
                      {
                        "context": "http://iiif.io/api/auth/1/context.json",
                        "@id": "https://spruce.dlib.indiana.edu/users/sign_in?login_popup=1",
                        "@type": "AuthCookieService1",
                        "confirmLabel": "Login",
                        "description": "Avalon Application requires that you log in with your account to view this content.",
                        "failureDescription": "\\u003ca href=\"http://example.org/policy\"\\u003eAccess Policy\\u003c/a\\u003e",
                        "failureHeader": "Authentication Failed",
                        "header": "Please Log In",
                        "label": "Login Required",
                        "profile": "http://iiif.io/api/auth/1/login",
                        "service": [
                          {
                            "@id": "https://spruce.dlib.indiana.edu/master_files/c821gj948/medium.m3u8",
                            "@type": "AuthProbeService1",
                            "profile": "http://iiif.io/api/auth/1/probe"
                          },
                          {
                            "@id": "https://spruce.dlib.indiana.edu/iiif_auth_token/c821gj948",
                            "@type": "AuthTokenService1",
                            "profile": "http://iiif.io/api/auth/1/token"
                          },
                          {
                            "@id": "https://spruce.dlib.indiana.edu/users/sign_out",
                            "@type": "AuthLogoutService1",
                            "label": "Log out",
                            "profile": "http://iiif.io/api/auth/1/logout"
                          }
                        ]
                      }
                    ]
                  }
                ]
              }
            }
          ]
        }
      ],
      "width": null,
      "height": null,
      "duration": 397.531
    }
  ],
  "structures": [
    {
      "type": "Range",
      "id": "https://spruce.dlib.indiana.edu/media_objects/9593tv280/manifest/range/r19d32083-8b38-444a-9bc0-ac31bac6c304",
      "label": null,
      "behavior": "top",
      "items": [
        {
          "type": "Range",
          "id": "https://spruce.dlib.indiana.edu/media_objects/9593tv280/manifest/range/r7a5dabd8-c2ab-48ef-aa1d-9743a58e6475",
          "label": null,
          "items": [
            {
              "type": "Canvas",
              "id": "https://spruce.dlib.indiana.edu/media_objects/9593tv280/manifest/canvas/c821gj948#t=0,"
            }
          ]
        }
      ]
    }
  ],
  "thumbnail": [
    {
      "id": "/assets/audio_icon-7782bcf9fd5d81f1e3e3f260ed569c24dea47d0a2a5bd0a4629328c76e8886c6.png",
      "type": "Image"
    }
  ]
}