how to edit/customize Hire and Transfer Approval Notification with Person Number

Summary:

Customer ask is to update the Hire and Transfer Approval Notification with Person Number.

Content (please ensure you mask any confidential information):

Any approval if triggers for Hire and Transfer flow, its notification should include Person Number also. We need to customize the Approval Notification. Please suggest the process.

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