Istio & Keycloak

There is quite a bit of discussion of Istio and Vault and Istio and Auth0. Well at least Auth0 does have some external dependencies. I would like to know about Istio support planned or current for Keycloak which is open source and can run entirely on private network. What is the level of support for this now or planned? And what are some of the ways Keycloak could be integrated for authorizations and user support today? Does anyone know about Keycloak and Trusted JWT?