Email classification for AP invoices approval flow (Fusion Payables)

Our client wants to set a specific security classification in the system for outgoing emails regarding approval flow for AP invoices.

They need to classify all the in coming and out going  AP invoice approval emails with the security classification. That means that each person who is part of the flow for approving  an invoice need to classify before opening the email. Reference screenshot is attached below.

Please let us know if we can achieve this functionality when the approval email is triggered in Oracle Fusion Payables

Thanks in advance.