Hi RT3,
I don't believe there is done yet an implementation to support co-browsing in OutSystems.
That said, I googled and found a company that sells a paid API that allows you to integrate co-browser.
You could try to integrate that, there is 14-days trail.
https://channel.me/docs/97503/co-browsing-server-api
Maybe there are more companies that provide such an API maybe for free, I suggest you google yourself a bit more.
Regards,
Daniel