Sales Insight Email Performance Report - Field for Subject Line

I would love to be able to add an additional column to this report so we could view the subject line of each email.

I send this report out regularly to our sales team so we can see which templates are yielding the best results but the only identifier field for the email sent is the email name.  It would be much more helpful if we could pull the subject line into this report so we can easily pick out subject line trends all in one report, instead of having to reference back to the template itself to find out what subject line is being used for each email.