Donut chart

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/DonutChart",
  "title": "Donut chart",
  "description": "A chart that can display one-dimensional data in a hollow, segmented circle.  To use this chart, ensure that\nthe query includes only one dimension (not `time`).\n",
  "type": "object",
  "properties": {
    "chart_title": {
      "description": "The title of the chart, which is displayed in the tile's header.",
      "type": "string",
      "nullable": false
    },
    "type": {
      "type": "string",
      "enum": [
        "donut"
      ]
    }
  },
  "additionalProperties": false,
  "required": [
    "type"
  ]
}