charts-8.x-4.x-dev/modules/charts_api_example/charts_api_example.routing.yml

charts_api_example.display:
  path: /charts/example/display
  defaults:
    _controller: '\Drupal\charts_api_example\Controller\ChartsApiExample::display'
    _title: 'How to Use the Charts API'
  requirements:
    _permission: 'access content'