If I understand you correctly, then you can use `jj interdiff --from name-of-branch@remote --to name-of-branch@git` in order to recover the diff between the rem

If I understand you correctly, then you can use `jj interdiff --from name-of-branch@remote --to name-of-branch@git` in order to recover the diff between the remote branch commit and your local version of it; you could then turn that invocation into a Git .patch file and reapply it with patch(1). This only works for one commit. The more general solution you're looking for I guess is some kind of "split based on interdiff" or something like that. I don't believe there's any way to accomplish this in a single stroke, though.