There is nothing at the moment, I’ll have to include exiv2 library as a dependency, so it will take me some time, but it is something I’d like to have.
There are off course some choices to do about which metadata to include - you can be stitching photos with quite varying metadata in theory, but adding most fields from the first photo can be a good first implementation + adding something like “stitched from x photos by Xpano” to the comment