config.nvim/lua/plugins/zk.lua

require("zk").setup({
    -- can be "telescope", "fzf" or "select" (`vim.ui.select`)
    -- it's recommended to use "telescope" or "fzf"
    picker = "telescope",

    lsp = {
        -- `config` is passed to `vim.lsp.start_client(config)`
        config = {
            cmd = {"zk", "lsp"},
            name = "zk"
            -- on_attach = ...
            -- etc, see `:h vim.lsp.start_client()`
        },

        -- automatically attach buffers in a zk notebook that match the given filetypes
        auto_attach = {enabled = true, filetypes = {"markdown"}}
    }
})