How to create a group and assign RLS in Power BI Service?

I have over 1600 users that I want to assign RLS.  I have set up the RLS configuration on my Power BI Desktop and everything works fine.  However, I understand that the 2nd step is to assign RLS security on the Power BI Service Portal as outlined in Microsoft's documentation (see link below). 

https://docs.microsoft.com/en-us/power-bi/report-server/row-level-security-report-server#add-members-to-roles

However, the use case outlined in Microsoft's documentation only provides examples where you add members one at a time.  How can I a batch of users at one time?

Please advise