Twitch two images stream?

My friend and I want to stream on Twitch, but only on one channel.

Now my question is; how can I also stream his view because we both use our own PC. As a recording program, I use Streamlabs, is there an easy way to stream and watch his and my video through Twitch?

I hope for a quick answer, thank you very much.

This works without delay and in reasonable quality only if you are sitting in the same network and have a third PC as a streaming computer available.

http://www.zoddelzockt.de/dual/