help with creating an mlua api to spawn a cube

[GoatCedric]

use bevy::prelude::*;
use mlua::prelude::*;

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_systems(Startup, run_lua)
        .run();
}

fn newObject(_: &Lua, type: String) -> LuaResult<()> {
    commands.spawn((
        Mesh3d(meshes.add(Cuboid::new(1.0, 1.0, 1.0))),
        MeshMaterial3d(materials.add(Color::srgb_u8(124, 144, 255))),
        Transform::from_xyz(0.0, 0.5, 0.0),
    ));
    Ok(())
}

fn run_lua(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    let lua = Lua::new();

    lua.globals()
        .set("create_new", lua.create_function(newObject).unwrap())
        .unwrap();
    lua.load(std::fs::read_to_string("./test.lua").unwrap())
        .exec()
        .unwrap();
}

I want to be able to do something like this, but I have no idea how to access commands, meshes and materials from within the newObject function. (I'm new to both Rust and Bevy. If you reply, please explain as well as possible so that I can understand)
Any help is appreciated!