passing arguments through to group?

I am trying to implement grouping on a Date column and I want to be able to provide options to group by month/week/year/day/hour etc...

It should be easy to do by manipulating the getGroupingValue to format the date.

Does anybody know if there is a way to create a grouping function (not an aggregation function) similar to how the FilterFn provides access to the filterValue?
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