ExtraDataBundle/Resources/config/services.yml

services:
    extra_data.sonata_admin_configure.listener:
       class: ExtraDataBundle\EventListener\SonataAdminConfigureListener
       tags:
           - { name: kernel.event_listener, event: sonata.admin.event.configure.form, method: addOptions }
           - { name: kernel.event_listener, event: sonata.admin.event.configure.show, method: addTemplate }
           - { name: kernel.event_listener, event: sonata.admin.event.configure.list, method: addTemplate }