Secure Supabase query with Buildship

Hi,
I'm developing an application with FlutterFlow and a Firebase / Supabase backend.

You're going to ask me why I'm using both backends? Because I want to access certain Firebase features that are not easily integrated with Supabase, so I authenticate on Firebase and I use the uid of my user table to make the link with my objects that are stored on Supabase.

The problem with this setup is that I lose all the advantage of RLS...

I wanted to know if I could use Buildship to secure my calls between Flutterflow and supabase? If so, do you have any idea how I could do this?

Thanks for your help