git push -o merge request.create

git push -o merge_request.create -o merge_request.target=my-target-branch origin my-branch 

• Pull request: gh pr create

git push [ -v | --set-upstream | -o | --set-upstream origin master | -u origin main | origin master | -u origin master | --delete master | -u | origin HEAD | --dry-run ], Git: upstream, git push --force