**Is your feature request related to a problem? Please describe it.** [vlty.vim](https://github.com/lervag/vimtex/blob/56def42c4f3007979c38001518ebb92ea8fb5f72/compiler/vlty.vim#L7) checks for python by running `executable('python3')`. However I have multiple pythons in my environment and I want it to use `python` instead. **Describe the solution you'd like** Have a global variable to specify python path or even better neovim `provider.python` already has support for custum python installation with `g:python3_host_prog`.