I think this is likely an exp-run level change.
I have a recollection of doing this before, but can't find any reviews enshrining that (it may have been just for nvme-cli)
Not sure who else to add to the review.
The two different APIs are close, but not identical and I tried to chase down all the differences and implement or document them.
https://reviews.freebsd.org/D19500 tried to do this before, but it was never committed. I've included the feedback / info from it.
I'll do an exp run before pushing this in.