There was this old 2019 thread where Nate recommended ‘Exporting as a catalog’ in order to transfer the file successfully to someone else using NLP, I’ve never tried it myself.
Elsewhere around the same time he suggested that he might look at incorporating settings in a DNG file but I don’t know if anything came of it. Generally he recommends just exporting a tiff from within NLP.
I think it’s a bit dodgy sending a RAW file to an agency anyway really, never mind NLP, surely you just want to send them the file as you have processed it so a 16-bit Tiff should cover that.