[
  {
    "label": "Greeting text",
    "name": "greeting",
    "type": "text",
    "default": "Hello world!",
    "description": "The greeting text displayed to the end user."
  },
  {
    "label": "Card image",
    "name": "image",
    "type": "image",
    "optional": true,
    "description": "Image shown on card, optional. Without this the card will show just the text."
  }
]