dev/defs/shapes/image.json

{
  "name": "Image",
  "key": {
    "int": 100,
    "string": "image"
  },
  "extends": "drawable.json",
  "properties": {
    "assetId": {
      "type": "Id",
      "typeRuntime": "uint",
      "initialValue": "Core.missingId",
      "initialValueRuntime": "-1",
      "key": {
        "int": 206,
        "string": "assetid"
      },
      "description": "Image drawable for an image asset"
    }
  }
}