Restricting members of a group to specific projects

Hello,

I would like to restrict access to specific project repos in a group for each member. Is there a way to do this?

Ex.
Group : RobotDev
Projects: Proj1, Proj2, Proj3

Users:
Owner - can access all Proj1,2,3
Tester --> only can access Proj3.

Is this possible?

Thanks!