{
  "elements": [
    {
      "image": "bg.png",
      "position": {
        "position_anchor": "CENTER",
        "position_unit": "PERCENTAGE",
        "x": 50,
        "y": 50,
        "size_unit": "PERCENTAGE",
        "width": 100,
        "height": 100
      }
    }
  ]
}
