Dynamic Row level security help

HI,

I have data like below for orders table and roles table.
Roles table:

Orders table.

Now Orders tables has 3 countries, US, UK, canada and Roles table has which country data accessed by which user.

Now based on user login to the report Orders table data has to be filtered with RLS.

How to do that?

As of now i dont have any relationship between these 2 tables.

Kindly help