Split a revision in two. More information: https://jj-vcs.github.io/jj/latest/cli-reference/#jj-split.
jj split {{[-r|--revision]}} {{revision}}
jj split {{[-r|--revision]}} {{revision}} {{fileset}}
jj split {{[-r|--revision]}} {{revision}} {{[-d|--destination]}} {{revset}}
jj split {{[-r|--revision]}} {{revision}} {{[-B|--insert-before]}} {{revset}} {{[-A|--insert-after]}} {{revset}}
jj split {{[-r|--revision]}} {{revision}} {{[-p|--parallel]}}