Historical average month

I have found it very helpful to calculate the average expense for a given envelope in the past eg. The past 12 months, past 6 months or some other period to establish my fill amount each month for each envelope. While most often it us the over 12 months average, but depending on the envelope and the volatility of the expense could be some other period.
Does GB have any way of accomplishing this?
I use Quicken alongside GB so I have tax information, and I can get that type of ,“average month” report that way, but it would be a plus if GB provided a method.

Easiest I’ve used is to just run the spending by envelope report for 12 months, filter by the envelope I’m interested in, and divide the total by 12. Yes it’s manual but it’s not a big deal.