Add # of sales at the grade level vs. item level in the API

I use the SportsCardsPro API (/api/product) and would like to request one addition: sales volume broken out by grade, matching the grades the price fields already cover.

Today the API returns a single product-wide sales-volume, while prices are returned per grade — ungraded, PSA 9, PSA 9.5, PSA 10, BGS 10 and so on. That makes the volume figure impossible to attach to the price it sits next to. A product reporting 90 sales might be 84 ungraded, 4 in PSA 9 and 2 in PSA 10, and the API gives no way to tell.

Something like this would fully solve it:

"sales-volume": 90,"sales-volume-by-grade": {  "ungraded": 84,  "psa-9": 4,  "psa-9.5": 0,  "psa-10": 2,  "bgs-10": 0}