Is there a way to fetch HR Representative user name for an Absence Approval request with Approvals

Summary:

Hi All,

I need to know if we can fetch a specific representative type for an employee ,within approval rules set up for approving absence requests i.e. "Global Absence Recording - Single Assignment"

My requirement is to identify a Branch Self service user who has a admin login but have an approval similar to employees. So I need to differentiate between this category of admins and the rest. Only way I could do is either by identifying application role attached to branch self service user (which doesn't seem feasible ) or matching username of the Branch Self service Representative of the employee and the requestor user name.