How can I implement bell notification system triggered by specific conditions in the purchase order

Summary:

I need to notify users when a purchase order line status is "closed for receiving" and the line type is "goods," with the message: "PO (no. x) is ready to be invoiced." Although I've explored the notification preference tool, I couldn't find any standard objects

related to purchase orders. How can I configure a bell notification to be sent to specific users when a purchase order meeting these conditions is submitted?

Content (please ensure you mask any confidential information):

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

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