how can i create mappings in a dedicated file

[Shmerlard]

hi, im pretty new to neovim and lua, i have configured my neovim in a way that i have a file for each plugin and a file for every keybind, how can i change the mapping of neo-tree like that,
this is the my neo-tree config:

return {
    "nvim-neo-tree/neo-tree.nvim",
    branch = "v3.x",
    dependencies = {
      "nvim-lua/plenary.nvim",
      "nvim-tree/nvim-web-devicons", -- not strictly required, but recommended
      "MunifTanjim/nui.nvim",
    },
    config = function()
        require("neo-tree").setup({
            filesystem = {
                window = {
                    mappings = {
                        ['l'] = { command = "open", nowait = true},
                        ['h'] = { command = "close_node", nowait = true}
                    }
                }
            }
        })
    end

}

my mapping.lua looks something like this:

vim.keymap.set('i', 'jk', '<Esc>', {noremap = true, silent = true})

-- navigate between windows
vim.keymap.set('n', '<C-h>', '<C-w><C-h>', { desc = 'Move focus to the left window' })
vim.keymap.set('n', '<C-l>', '<C-w><C-l>', { desc = 'Move focus to the right window' })
vim.keymap.set('n', '<C-j>', '<C-w><C-j>', { desc = 'Move focus to the lower window' })
vim.keymap.set('n', '<C-k>', '<C-w><C-k>', { desc = 'Move focus to the upper window' })