How to allow an employee to select Assignment for which they want to make Benefit Enrolment?

Summary: We are trying to configure Annual Leave Purchase using Benefits module. Annual Leave can be purchased per assignment as there are different Absence Plan enrollments per assignment. Employee while taking leaves also select the assignment from which the balance should be deducted.

Does anyone know how to help employee identify the Assignment?

Content (required): The issue is while enrolment there are 2 Benefits Program shown to employee since he has multiple assignments but it doesn't show which program is for which Assignment. Through Benefits manager it is easy to identify which Assignment we are enrolling into as shown in below Screenshots