Add a “Theme info” button to a Shopify theme: https://docs.shopify.com/themes/theme-development/storefront-editor/add-theme-info-button

settings_schema.json

 {
    "name": "theme_info",
    "logo": "https:\/\/cdn.shopify.com\/s\/files\/1\/0070\/7032\/files\/2010_6_23_Shopify-Green_256x256.jpg",
    "settings": [
      {
        "type": "header",
        "content": "Shopify Cool Theme"
      },
      {
        "type": "paragraph",
        "content": "v1.0.0.5"
      },
      {
        "type": "paragraph",
        "content": "See the theme [documentation](https:\/\/docs.shopify.com\/themes) on the Shopify site for more information about this wonderful theme."
      }
    ]
  },