It does not, or at least not very well. Merges can't be rebased without replaying conflict resolution; since Git lacks a first-class concept of conflicts, that becomes a manual process.
Moreover, jj should be able (I haven't explicitly tried this) to autogenerate the conflict resolution in the `jj absorb` case, since it knows what the final post-merge state should be.
Moreover, jj should be able (I haven't explicitly tried this) to autogenerate the conflict resolution in the `jj absorb` case, since it knows what the final post-merge state should be.