[keycloak-user] Realm as identity provider

Hello, I'm currently working on a use case for which I need to use a realm as an identity provider for others realms. Everything is working fine except that the "realm_access" claim that I originally obtain from the parent realm isn't propagated in the token I finally retrieve. Considering the schema in the relevant section of the docs I guess the child realm forge it's own token based on the one received from the parent realm. Anyway, is there anyway to concatenate le realm_access claim ? So far, I've tried to do it by defining identity provider mappers but without any success. Yours,