Email in the Bursting Definition in Management Reporting

Summary:

hello, we submit over 100 reports each month to the users, using reports/report books and bursting definitions for emailing reason.

I'm restricted on the subject of the email by DataTime(), ArtifactName() and ArtifactDescription()

Question is -

Is there a way to add to the subject of the email in the bursting definition, by using a substitution variable or some other methods. The alternate solution is to hardcode the Month to each bursting definition, which I rather not, as it would be time-consuming..

Content (required):

Bursting definition -> Book -> Report

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