OpenAPI document with format: text in a JSON schema

openapi.json

{
  "openapi": "3.0.3",
  "info": {
    "title": "API with `format: text`",
    "description": "API with `format: text`.",
    "contact": {
      "name": "Lorem Ipsum",
      "url": "https://www.example.com/",
      "email": "api@apiture.com"
    },
    "license": {
      "name": "API License",
      "url": "https://www.example.com/license.pdf"
    },
    "version": "0.1.0"
  },
  "tags": [
    {
      "name": "Text",
      "description": "Text Services"
    }
  ],
  "servers": [
    {
      "url": "https://api.example.com/test"
    }
  ],
  "paths": {
    "/text": {
      "get": {
        "summary": "Return lorum ipsum text",
        "description": "Return lorum ipsum text",
        "operationId": "getText",
        "tags": [
          "Text"
        ],
        "responses": {
          "200": {
            "description": "OK",
            "content": {
              "text/plain": {
                "schema": {
                  "$ref": "#/components/schemas/text"
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "text": {
        "title": "Text",
        "description": "Lorum Ipsum text",
        "type": "string",
        "format": "text"
      }
    }
  }
}