How to make a proxy server on the user side?

Question

JavaScript

There is an application on electron on the user side and a server on the node.
It is necessary that when you run the application on a host in the local network, you can connect to the computer with it as a proxy.
So that a browser can be opened on the server using puppeteer and the user's ip address as a proxy server.

There is a working option to use a socks server on the client side (in the application), but this requires the use of port forwarding on the user's router, so this option is not suitable.

In other words, how to proxy all traffic through the user's ip behind NAT without using port forwarding on his router?