Is it possible to change use role to be an admin?

Hi, my app has regular logged in users, but I'd need some users to be admins so that they can access the backoffice.

From the UI i'd check if they are admin and let them see the backoffice, from supabase I will also create policies that will only allow queries in the backoffice to users with role admin.

How would you change the role? I was not able to find anything about this.

Thanks