This Enhancement is primarily raised against the documentation team. But the QE could possible help (in Tasks) for possible validation on any clear migration paths we would document and identify as supported.

Please make the RH-SSO documentation (upgrade/migration/intsallation doc) to cover some chapter(s) on how feasible is to migrate from a Keycloak community version to a RH-SSO supported release, and hence to provide guidelines for the same migration path(s).

I have authored this KB solution in the Customer Support Portal as a couple of customers raised a similar question:
KB#2594681: How feasible is to migrate from Keycloak to Red Hat SSO (RH-SSO which is based on Keycloak) ?