Parsing multiple languages in a single file?

[NovaViper]

I'm wondering if it's at all possible to have tree-sitter to use multiple tree-sitter languages in a single file. Specifically, my use case involves me having some shell snippets within a .nix file or lua snippets within a .nix file.
I saw this on the official Emacs documentation but that seems to be related to the built-in treesit package and not tree-sitter.