MATCH(...,1) returns the position of the largest value less than or
equal to the lookup value when the lookup array is sorted in asceding
order.

Is there a standard Excel function or standard Excel add-in that
returns the position of the largest value less than or equal to the
lookup value when the lookup array is sorted in descending order?

I know I can write a VBA function. And there might be non-standard
add-ins -- that is, add-ins that are not distributed with Excel. But
I prefer to use a standard Excel function or standard Excel add-in.