Allow Approver to edit the details of the requester in Web Designer

In the Web Designer I have an IT shop item-Service Account, when a person requests for that Item he needs to fill in some details and then send it for approval.

The Hierarchy for the same is- Business Owner->Product Owner.

I want the details mentioned by the Requester to be editable by the Product Owner.

Kindly let me know, how to do so.