Using EasyEngine 4 + NodeBB subfolder option?

[Kosiak]

EasyEngine (ee) is a linux shell-script collection, which makes managing your WordPress and Nginx sites on an Ubuntu server easy and fun. Now EE4 using Docker.

I would like to install EasyEngine + NodeBB like example.com/forum/
Any ideas how to build it together?

There have topic https://community.easyengine.io/t/how-to-run-node-js-app-on-v4/11482 about it from EE developer and his explanation looks like very hard. My devops skills still low. Maybe for NodeBB team it will not so hard and we will receive manual how to use it together.

Installation guides and examples of nginx configurations are welcome.

Thx!