You would need to override neutron_extension_drivers (it's a list) - https://github.com/openstack/kolla-ansible/blob/66ec9cef5557770acb2bd89a107535150af243ba/ansible/roles/neutron/defaults/main.yml#L666
You would need to override neutron_ extension_ drivers (it's a list) - https:/ /github. com/openstack/ kolla-ansible/ blob/66ec9cef55 57770acb2bd89a1 07535150af243ba /ansible/ roles/neutron/ defaults/ main.yml# L666