It would be lovely indeed. Unfortunately, it’s not a simple matter.
Adobe does not document how their algorithms work, nor do they document what the parameters in XMP stand for. Here is a part of an XMP from Lightroom.
crs:Exposure2012=”-1.61″
crs:Contrast2012=”0″
crs:Texture=”-50″
Apparently, some algorithms changed in 2012. Even Exposure and Contrast. From what to what? What is “Texture” (mathematically)?
Further, Nitro does not have all of the adjustments that LR has – so all of those would have to be created from scratch AND match theirs.
It’s like translating Italian to English. The letters are the same, and the basics of sentences and grammar are similar. But it has to be done without a) a dictionary, b) anyone to talk to c) how to detect idioms.
Not impossible, but impractical without spending essentially an unlimited amount of time. There are apps like Avalanche that make an attempt, but even they only convert a subset of adjustments, and not perfectly.