content: {
    "$id": "https://github.com/kurema/BookViewerApp3/tree/master/BookViewerApp/Views/BrowserTools/CushionInfo.json",
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "properties": {
      "content": {
        "type": "string"
      },
      "filename": {
        "type": "string"
      },
      "url": {
        "type": "string"
      }
    },
    "title": "Info of the cushion page",
    "type": "object"
  }