bookish_admin-1.0.x-dev/modules/bookish_image/bookish_image.services.yml

services:
    paramconverter.bookish_image.image:
      parent: paramconverter.entity
      class: Drupal\bookish_image\ParamConverter\BookishUuidConverter
      tags:
        # Priority 10, to ensure it runs before @paramconverter.entity.
        - { name: paramconverter, priority: 10 }