[keycloak-user] How to generate OIDC Token for users originating from a saml identity provider?

Hello, I'm using saml identity provider and version 3.4.0-final of Keycloak. I made the necessary settings so that these users were persisted as valid users in Keycloak, until this point I had no problem. My application has some modules that work with services authenticated by tokens. Is it possible to generate tokens with the saml assertion of the user who logged in via saml identity provider? Is there any specific grant_type or client_assertion_type for this? I made a series of attempts but without success. Has anyone here needed to implement a similar implementation? https://tools.ietf.org/html/draft-ietf-oauth-saml2-bearer-20#page-5