Approval procedure for Role entitlement assignment (system roles to Business Role)?

Hello

I'd like to create an approval policy and approval workflow to be used in the standard service item "Role entitlement assignment".

an approval should be given by the owner of the entitlement, which is a System Role, eventually an AD Group.

Does anyone know a good approach to evaluate the owners of the System Roles (and AD Groups) which are assigned to a Business Role or Department by using "Role entitlement assignment"? 

It seems there is no such approval procedure OOTB.

Any help is greatly appreciated.

Kind regards, and thanks in advance for any advice.

Edi