Is there a REST API or custom action available to reassign buyer for approved requisition lines.

We have a requirement to automatically assign approved requisitions (created via Planning Release or Replenishment Request) to the organization/site-level buyer’s queue in Process Requisitions.
Currently, these requisitions are in an approved state but not assigned to the desired buyer.
Is there any possibility to update the buyer assignment through an Extension using REST API or any other supported approach?

Are there any limitations or prerequisites for using this approach?