sudo apt install zsh-autosuggestions zsh-syntax-highlighting zsh
Press Ctr + Shift + j to open devtools console in crostini terminal.
Paste this to use Jetbrais Mono with ligatures:
term_.prefs_.set('font-family', 'JetBrains Mono NL Regular Nerd Font');
term_.prefs_.set('user-css-text', '@font-face {font-family: "JetBrains Mono NL Regular Nerd Font"; src: url("https://raw.githubusercontent.com/ryanoasis/nerd-fonts/master/patched-fonts/JetBrainsMono/NoLigatures/Regular/JetBrainsMonoNLNerdFontMono-Regular.ttf"); font-weight: normal; font-style: normal;}')