[keycloak-user] Custom SAML request parameters

Hello, I've got a custom authentication flow (based on Authentication SPI) which uses additional OIDC parameter - login_hint - passed in the request (as described in Parameters Forwarding in Keycloak docs). It's working great, but I also want to connect some clients to the same realm using SAML protocol. The problem is it will be using the same authentication flow and I want to retrieve the same information as passed in login_hint parameter in requests from OIDC client. The question is: Do Keycloak predicts something like custom parameters added to SAML endpoints? If not, what is the best way i could achieve that and get that information from client request in my authentication flow? kind regards, Bartosz