How to restrict access at the level of semantic model inside workspaces

[Essjay]

The use case is: One Power BI Premium workspace with ~15 semantic models like M1,M2,Mn..... Different user groups G1, G2, Gn are added to the workspace with different roles (viewer, member, contributor). 

Is there a way that we can restrict access of Group G1 to only model M1. 

I know that RLS is overriden by workspace roles! I am trying to figure out if there is a way we can further restrict access as  per Model and group combination inside same workspace.

Any pointers are helpful! TIA

[lbendlin]

Familiarize yourself with apps and audiences.

[Essjay]

@lbendlin : I would like to clarify that I was talking about members and contributors acess & not viewers access. We have APP set up for viewers access.

[lbendlin]

In that case your only option is separate workspaces.