{
  "default-node": {
    "type": "box",
    "default-font": {
      "size": 14,
      "name": "Helvetica"
    }
  }
}

{
  "default-node": {
    "type": "box",
    "group-id-font": {
      "size": 14
    }
  }
}

Adjust to new merge mechanism
Adjust to new merge mechanism