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If the user specifies a Name, Jet Reports would create an Excel Named Range for the NL function address. This would make it very easy to use with the NF function as you could pick out the named range instead of having to type in or select an address. Perhaps the Name could be saved in a cell comment to avoid making the NL function argument list even longer and causing breaking changes.
The ability to easily specify named ranges in Excel currently exists. This is not an area that we plan on focusing our development efforts at the moment.