With Netscaler (as SP) in OIDC/Oauth2 I'm getting the user's UUID in preferred_username. I can pass it automatically in SAML (NetScaler as SAML IdP) in the NameID. But if I would need to add the value in preferred_username to a custom claim in SAML, how could I do that? Is there a way to store the preferred_username in one of the internal attributes and then add it to SAML IdP claim? I’ve done this with LDAP but the OAuth SP action is a bit confusing