Keycloak - how import groups from Crowd

Using Keycloak Crowd User Storage Library I can access to users, their details and attributes, as well as crowd group memberships.

Unfortunately, however, from Keycloak (Manage/Groups) I cannot see the list of Crowd groups.
Is there a library I can use to import Crowd groups into Keycloak?
Alternatively, could you tell me the steps to follow for this purpose? Can I implement any particular interface?

Thanks in advance.