web_push_notification.links.menu.yml

web_push_notification.settings:
  title: 'Web push notification'
  description: 'Web push notification settings.'
  route_name: web_push_notification.settings
  parent: system.admin_config_services

web_push_notification.test_notification:
  title: 'Test notification'
  description: 'Send a test notification to subscribed users.'
  route_name: web_push_notification.test_notification
  parent: web_push_notification.settings