[keycloak-dev] How to get refresh keys from Google Identity Provider?

Hello, I have Keycloak configured and working with Google Identity Provider. I have configured the Default Scope of https://www.googleapis.com/auth/youtube.force-ssl. It seems that Google is getting that scope because when I authenticate against Keyclock, Google is asking me for the permissions that match that scope. API. What I cannot get is the Google refresh token. My understanding is to get the refresh token from Google access_type=offline needs to be appended to the Google Auth URL. I have been unable to find how I can get Keycloak to append access_type=offline to the URL so I can gain access to the Google refresh token, for offline access. Does anyone know what I need to do to have Keycloak request that offline access so I can retrieve the Google refresh token? Thanks for your help! Nick