mailjet-8.x-2.7/modules/mailjet_list/mailjet_list.routing.yml

list.content:
  path: '/admin/config/system/mailjet/mailjet-panel/list'
  defaults:
    _controller: 'Drupal\mailjet_list\Controller\ListMailjetController::content'
    _title: 'Contacts'
  requirements:
    _mailjet_access_check:  'TRUE'