Row Level Security: DAX Filtering other than username()

Hi,

I am new to Power Bi, please forgive my misuse of terminologies.
I am trying to implement Row Level Security for providing multilevel access for 120000 Users.
I have, so far, tried using the username() function using a sample data and it worked.

Now, given that the actual data that we will eventually use does not have an email column like my sample data and since i am trying to avoid medling with our client's Database, Is there a way to use, for instance, an employee ID in the DAX expression? I will have to add the Employee IDs to our AD User pool but will Power Bi see that ID and eventually use it for the Filtering?

Thanks for the Help!!