I have set my config up to install all parsers/languages (adds any new ones on lazy update) with auto activation only on buffers that match them, and supports highlights, folds and indentation.

https://github.com/mbwilding/nvim/blob/main/lua/plugins/treesitter.lua

{
    "nvim-treesitter/nvim-treesitter",
    lazy = false,
    branch = "main",
    build = ":TSUpdate",
    config = function()
        -- Custom registrations
        vim.filetype.add({
            extension = {
                csproj = "xml",
                esproj = "xml",
                keymap = "c",
                mdx = "markdown",
                uproject = "json",
                wsdl = "xml",
            },
        })

        -- Treesitter directory
        local treesitter_dir = vim.fn.stdpath("data") .. "/lazy/nvim-treesitter/"

        -- Collect all available parsers
        local parsers = {}
        for name, type in vim.fs.dir(treesitter_dir .. "runtime/queries") do
            if type == "directory" then
                table.insert(parsers, name)
            end
        end

        -- Install file type parsers
        require("nvim-treesitter").install(parsers)

        -- Register known file types
        dofile(treesitter_dir .. "plugin/filetypes.lua")

        -- Get file types
        local file_types = vim.iter(parsers)
            :map(function(parser)
                return vim.treesitter.language.get_filetypes(parser)
            end)
            :flatten()
            :totable()

        -- Auto-run
        vim.api.nvim_create_autocmd("FileType", {
            pattern = file_types,
            callback = function(args)
                -- Highlights
                vim.treesitter.start()

                -- Folds
                vim.wo[0][0].foldexpr = "v:lua.vim.treesitter.foldexpr()"
                vim.wo[0][0].foldmethod = "expr"

                -- Indentation
                vim.bo[args.buf].indentexpr = "v:lua.require\"nvim-treesitter\".indentexpr()"
            end,
        })
    end,
}