How to configure row level security

Hi,

I need to restrict data access in my power bi report. Following are the categories that I want to define:

1. Category 1 - Users should be able to access all data (no restrictions to be applied)

        1.1 the user email id is present in my back end dataset

         1.2 the user email id is not present in my back end dataset

       for both 1.1 and 1.2 the users should be able to view all data and access the dashboard

2.Category 2- Users should be able to access data relevant to them

For category 2 I have configures RLS using userprincipalname() dax and it is working fine.

How do I configure for category 1.

Thanks!