How can I show Volume in Cu ft in Architectural Units? Is it even possible?

I can show entity volumes in Cu ft if I use Decimal inches, but the options to change from Cu inches is greyed out in Architectural units.

Is it not possible?

I want lengths to be feet, inches and fractions, but volume in cu ft (or even better, as it’s for concrete) cu yds.

Do I have to do the conversion from cu in in Generate Report in a spreadsheet?

That would be a nice feature to add to SU.