GroupBy node Feature Request 2

In the GroupBy node, please can we have an extra grouping option available besides the standard mathematical set.

We already have the arithmetic mean (Summing up all the values and then dividing by the number of values), but can we also have the geometric mean as an option (Multiplying up all the values and finding the nth root). In addition the geometric standard deviation.

This is useful for when dealing with values which are exponential in nature.