Changing the approver based on a form answer

Changing the approver based on a form answer

I'm trying to create an internal 'Leave Request' form, that would preferably go through the Approvals process. The issue is that there are 25 possible supervisors, and I can't think how to do this, because Zoho asks for one specific approver. Notifying the supervisor would be ok - is there a way to do this without asking the staff member to enter the supervisor's email address? (i.e. an email dropdown?)

If anyone has any ideas on how to create a leave form that can notify a supervisor, or be approved by a supervisor, please let me know!

Thanks