Rest APi to modify groups for RLS

Hi

I have a on-Prem Power BI report server where I upload pbix dashboards to. I am using row level security on a number of dashboards where i have defined groups that I manually assign users to. I would like to be able to assign users dynamically using REST APIs like Add Group User (https://docs.microsoft.com/en-us/rest/api/power-bi/groups/add-group-user)

I was wondering if this is possible on a on premise report server where we upload the pbix files to?

Will it only work for Power BI premium (Service) where I define workspaces, datasets and reports?

Is there any way to achieve this using APIs or via code?

Thanks

Jim