How to use local JS files in ACP script

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Hi,

How to require local utilities in my acpScript properly? I want to separate functions in my acpScript of my plugin into several JS files. My acpScipt is located at path public/lib/admin/index.js with codes:

'use strict';

/* globals socket, define, require */

define(
  'admin/plugins/myPlugin',
  [ 'myAdminUtilities' ],
  function (util) {
    const Admin = {};

    Admin.init = function () {
      socket.emit(
            'plugins.myPlugin.getData',
            myAdminUtilities.handleResponse,
      );
    };

    return Admin;
  }
);

Then, file myAdminUtilities is located at path public/lib/admin/utils.js with codes:

define('admin/plugins/myAdminUtilities', function () {
  const adminUtils = {};
  adminUtils.handleResponse = function (error, data) {
    // process data ...
  };

  return adminUtils;
});

Also, I have modified my plugin.json with following:

{
        ...

        "modules": {
		"myAdminUtilities": "public/lib/admin/utils.js"
	},

        ...
}

But, I get get admin/plugins/myAdminUtilities (404 Not found) every time I enter my plugin ACP page. What's the proper way to reach my goal?