[question] Equivalent of fzf#vim#files('~/projects', <bang>0) but for #grep or :Rg ?

- [x] I have read through https://github.com/junegunn/fzf.vim/blob/master/README.md
- [x] I have read through https://github.com/junegunn/fzf/blob/master/README-VIM.md
- [x] I have read through the manual page of fzf (`man fzf`)
- [x] I have searched through the existing issues

First thanks a lot for this plugin, I've been using vim for more than 10 years, and this plugin is the biggest productivity boost I got in a while
the one last thing I'm missing for it to be perfect, is to find how to have a "project level" grep/rg , is there an easy way to achieve that ?