How to pass parameter to an supabase API ?

Hi,

I would like to filter a Supabase table using a parameter, by passing a variable in the Supabase API.

Here's the raw address working fine:

I'd like to call this API from FlutterFlow and pass it a "COUNTRY" variable like this:

I've found several "solutions" that I've tested, using {{, [[, $], but none of them work.

I've consulted the Supabase documentation and watched several videos, but still no answer.

If anyone has a solution, I'm interested.

Thanks