Applying formulas to totals in summary view?

Applying formulas to totals in summary view?

I'm trying to run formulas on my data totals in summary view. Is there a way to do this? Or another way to calculate totals and do the same? Seems like a simple feature to not provide. Anyone analyzing large amounts of data would benefit. The last post I saw about this was over 4 years ago and the rep claimed you were working on it?