search for orders created by buyers reporting to same manager

Summary: Is there option to create saved search for Manage Orders task that shows all open PO with buyers reporting to same/given manager?

Even brute force option to use Buyer search criteria and populate list of buyers individually won't work as the only predicate available for Buyer is "Equal"

Content (required): Can we expand predicate list that seems to be locked?

For example, on the screenshot below Supplier and Buyer are locked into "Equal" predicate only. And business users liked to expand choice to "Between" or "Ends with", as example.

For example

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