Add user permissions when using Shibboleth auth provider

I’ve configured GitLab CE installation with Shibboleth omniauth provider. The authenticaiton and login works fine without issues.
My question is about permissions management:
Is there a way to predefine users that exist in the IdP which will have admin privileges when logged in ?
For example the users in the Identity Provider are: user1, user2, user3, user4. Is it possible to define GitLab setting in a way that when user1 and user2 is authenticated, they will have admin role granted in gitlab and when user3 and user4 are authenticated the will not have admin privileges ?

Thanks in advance !