farm-2.x-dev/modules/core/map/modules/mapbox/config/schema/farm_map_mapbox.schema.yml

farm_map_mapbox.settings:
  type: config_object
  label: 'Mapbox Settings'
  mapping:
    api_key:
      type: string
      label: 'Mapbox API Key'
      description: 'The API key used to request Mapbox imagery layers.'