It's not really usable to me as the workspace folder doesn't have .git in it, even though original repo is collocated and hence the git tools don't work there.
I am forced to use git work trees with separate collocated JJ repo each.
Some company tooling / git oneliners from internet / and probably most relevant for me is git plugins for neovim / some personal scripts I would have rewrite to work both in .git and .jj repos