Comparing Individual Performance against Averages Multiple Columns

Hello All!

I've got data that is set out as:

and I am trying to create a clustered column chart that shows an individual's Sales, Expenses and Profit/Loss goverened by a Slicer choosing Month and a Slicer choosing Sales Person compared against an average across all Sales Persons for the selected month. Similar to this:



Through unpivoting and calculating, I can get the individual columns to be created but I'm struggling with getting the Average columns to be created and to be added to a column chart, clustered as shown in the photo.

Thanks for any help you can provide!