A way to delay Approved Email Notification: External Supplier Registration

Summary:

We have a business requirement where we need to expose the Supplier Number in the Approved Email Notification once an External Supplier Registration is approved. We've noticed that even if we customize the data model to include the Supplier Number, once the workflow is approved, the email is automatically triggered before the Supplier Number is generated. Is there any possible way to delay the email notification to be triggered so that when the custom report is triggered the supplier number is already populated/created?

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