How to apply conditional formatting only to subtotals in total column

Is there a way to apply conditional formatting only to the subtotals in the total column.

I just need to apply it in the green field not in all the column/row

At present, we don’t have this feature. I will mark this as a feature request.

Also can you elaborate on your requirement or need? It looks like the need is to format all the subtotals in Totals columns and not based on any conditional formatting rule