Dynamic array horizontal lookup across 2D range

Hi,

I have attached an example workbook where I have six separated columns with date/time values. In a seventh column, I am have a XLOOKUP formula that returns the heading of the column that contains the maximum value for that row.

I would like to have a formula that does the same, but which doesn't require to be copied down through the column; in other words a dynamic array version.

Does anybody know how to do that?

Regards,
Marbleking