can i restrict the the buyer field to only procurementagent that could be shown in the suggestedlist

Summary:

Unable to restrict the suggested buyer list in the manage purchase order area.

Content (please ensure you mask any confidential information):

I want to restrict the suggested list of buyers in Purchase Orders to only users with the Procurement Agent access rights or the Buyer role, since the Buyer field currently shows all users created in the system.
We would like to understand where these values are coming from and how we can customize this list.

Version (include the version you are using, if applicable):

25C

Code Snippet (add any code snippets that support your topic, if applicable):