Enabling User Registration in KeyCloak Realm created/managed by Operator

Hi,
I’ve deployed the latest Keycloak operator (keycloak-operator.v11.0.0) on OpenShift 4.5.
When creating a realm I want to enable User Registration but there doesn’t seem to be an attribute in the CRD to enable this. Is there another way to achieve the same thing ?

cheers
Noel