how does Requestor populate the suggested supplier while raising requisitions

Summary:

We have many Suppliers for which we do not have "Blanket Purchase Agreements BPA" or "Negotiation Lines". The requesters want to Update the "Suggested Supplier" to the Buyers while raising the requisition not as a DFF note but dedicated field, just like BPA. Please see the attached Screenshot. In our Instance we can suggest a Buyer but we cannot suggest a Supplier.

Content (please ensure you mask any confidential information):

Buyers can filter based upon the suggested "Suggested Supplier" while processing the Document. Today only the Requisition Lines linked to BPA lines can be filtered by the Buyers. For the requisition lines not linked to the BPA, Buyers will have to go line by line to decide the Supplier. How can the Requestor Populate the Suggested Supplier where there is no BPA lines.