marketo_ma-8.x-2.x-dev/modules/marketo_ma_contact/marketo_ma_contact.routing.yml

marketo_ma_contact.contact.configuration:
  path: /admin/structure/contact/manage/{contact_form}/marketo
  defaults:
    _form: \Drupal\marketo_ma_contact\Form\MarketoMaContactConfiguration
    title: 'Marketo configuration'
  requirements:
    _permission: 'administer marketo'