How to use CMB2 inside new plugins?

CMB2 added inside my new plugin for metaboxes and got message from WP plugin reviewer team, How to use CMB2 inside new plugins?

Here is the message-

There are issues with your plugin code. Please read this ENTIRE email, address all listed issues, and reply to this email with your corrected code attached. It is required for you to read and reply to these emails, and failure to do so will result in your plugin being rejected.

## Including another plugin

We cannot accept a plugin that includes an entire other plugin, wholesale, inside it.

You have CMB2 – https://wordpress.org/plugins/cmb2/

While we understand the use of framework (or boilerplate) plugins, and encourage the use of common libraries, full blown plugins should never be included inside another, as it causes multiple potential issues, such as function/attribute conflicts, and also opens your code up for issues should the included plugin be closed for a security hole.

The proper way to include another plugin would be to require it in your own. You can use the hook is_plugin_active() to check to see if the plugin is, indeed, installed and active.

https://codex.wordpress.org/Function_Reference/is_plugin_active

The other alternative would be to actually fork the code, and not have a 100% copy in yours. Sadly, WordPress plugins don’t have the ability to do sub-modules, so you’ll have to actually customize the code for interaction.

Thanks for your help in advance!