Make Webrtc show proxy ip

Open http://f.vision.com with out proxy and u will see
Webrtc has 2 same ip values which are your real ip .

Bow use any proxy and open that website again and u will see rhey show proxy ip + your realip

I need to be able to make browser show the proxy twice like if its my real ip

I do not want to block webrtc or use vpn

Any other solution is acceptable