[keycloak-user] Why no Mapper Type -> User Client Role with SAML clients?

Hi there, It may have been asked already, but I cannot find it in keycloak-user email history and threads. So, I was wondering why it was not possible to have a mapper of type "User Client Role" with a SAML client. Only Role list is available but then it is also including realm roles which is a bit noisy. Thank you in advance for your time replying to that email. Cheers!