AppFlowy/frontend/app_flowy/packages/flowy_editor/example/assets/document.json

{
    "document": {
      "type": "text",
      "attributes": {
        "content": "TITLE"
      },
      "children": [
        {
          "type": "text",
          "attributes": {
            "subtype": "with-checkbox",
            "font-size": 30,
            "content": "aaaaaaaaaaaaaaaaaaaaaaaa",
            "checkbox": false
          }
        },
        {
          "type": "text",
          "attributes": {
            "subtype": "with-checkbox",
            "text-type": "heading1",
            "font-size": 30,
            "content": "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
            "checkbox": false
          }
        },
        {
          "type": "text",
          "attributes": {
            "text-type": "heading1",
            "font-size": 30,
            "content": "cccccccccccccccccccccc"
          }
        },
        {
          "type": "image",
          "attributes": {
            "image_src": "https://images.pexels.com/photos/12499889/pexels-photo-12499889.jpeg?fm=jpg&w=640&h=427"
          }
        },
        {
          "type": "text",
          "attributes": {
            "text-type": "heading1",
            "font-size": 30,
            "content": "dddddddddddddddddddd"
          }
        }
      ]
    }
  }