Language specific support means there is a combination of language specific plugins, `treesitter` support, `nvim-lspconfig` language servers, and `null-ls` integration. This gets you capabilities ranging from autocompletion to formatting to diagnostics. The following languages have sections under the `vim.languages` attribute. See the configuration docs for details.
In any of the `opt.languages.<language>.lsp.package` options you can provide your own LSP package, or provide the command to launch the language server, as a list of strings.
You can use this to skip automatic installation of a language server, and instead use the one found in your `$PATH` during runtime, for example: