Neovim and LaTeX with LazyVim, part 3: custom commands

This is a follow-up to the first post on Neovim and LaTeX and the second one. If you write LaTeX in Neovim using the LazyVim distribution, you already get a fantastic editing experience thanks to VimTeX and texlab. But there s one thing that often trips people up: how do you quickly wrap selected text in \emph{…}, [ ]