{
  "content": [
    {
      "attrs": {
        "layout": "center"
      },
      "content": [
        {
          "attrs": {
            "alt": "",
            "type": "external",
            "url": "https://example.com/moon.png"
          },
          "type": "media"
        }
      ],
      "type": "mediaSingle"
    }
  ],
  "type": "doc",
  "version": 1
}