I want to set the email subject in Notification To Approver>Advanced.

Content (please ensure you mask any confidential information):

Process Definition>**** Quote Process>documents
Transaction>actions
Submit>Edit Approvals>Approvers>Approval Details
Notification To Approver>Advanced>ADVANCED NOTIFICATION

Using the above settings, I am trying to create and send an email using BML.
I can successfully set the body of the email and send the test email, but I cannot change the subject of the email.
Is this possible?

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

25B Patch 2