DocumentApproval Rule to Auto Approve PO if requester contained in Approval Group

We are trying to create a new rule in the DocumentApproval BPM task configuration, that will auto approve PO's that are under $500 AND the Requester is contained in our new "Auto Approve" Approval Group.
Is it possible to create a rule in BPM that will auto approve PO's if the Requester is an employee listed in a certain Approval Group?
We cannot figure out how to reference an Approval Group when setting up the IF conditions for the "Auto Approve" rule.

We need a rule as follows…
IF…
the PO Requester is in the "Auto Approve" Approval Group
and the PO Total Amount is less than $500