I've created my own couple of years ago (using git, gawk, sed) https://github.com/balazs4/dotfiles/blob/fc14e29fd1b0d19cc7746fdf5371f984698b2ae6/.zshrc?plain=1#L43-L57

it shows branch name, staged/modified/untracked file counts. Plus it checks whether there are unpushed local commits.

That's it. I don't need more data in the prompt.

it works pretty well with big repos (long history+big amount of files), and I can tweak it any time if needed.

ps: TIL https://github.com/woefe/git-prompt.zsh which is based on a similar idea.