curl --request GET \
  --url https://api.example.com/journals/editor/model/{journal_id} \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "model": {
    "type": "<string>",
    "attrs": {
      "id": "<string>",
      "level": 123
    },
    "content": [
      "<unknown>"
    ],
    "marks": [
      {
        "type": "<string>",
        "attrs": {
          "id": "<string>",
          "level": 123
        }
      }
    ],
    "text": "<string>"
  },
  "message": "<string>",
  "timestamp": "<string>"
}