Choropleth map chart

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/ChoroplethMapChart",
  "title": "Choropleth map chart",
  "description": "A chart that displays data on a world map. Each region on the map is colored based on the metric value.\nThis chart works only with the `api_usage` datasource and requires a single metric and a single dimension of `country_code`.\nNo additional dimensions are supported.\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": [
        "choropleth_map"
      ]
    }
  },
  "additionalProperties": false,
  "required": [
    "type"
  ]
}