Hi Saeid,
Your question sounds very similar to mine Cannot see userinfo in Api endpoint although I don’t know what language you are using. I’m using .Net Code for the API and Angular for the SPA.
Anyway, as I understand it, it should be possibly with the help of Claims to get some form of user identity as I’m trying to do with the standard OIDC scopes.
I’ll let you know if I have any success with this but feel free to keep an eye on my topic 