Supplier contact name is not shown on the purchase order

The supplier has an email address at both the site and contact levels. However, the business wants the supplier's site-level email address to be used for the PO PDF communication. To achieve this, the contacts were not associated with the supplier address. Now, the issue we are facing is the contact names are not showing in the PO due to contact not associated with address.

How do I make the contact names shown in the PO without associating the contact to the address?

Supplier contact not associated with the address:

Above screenshot is from PO where the supplier contact is not shown