I route audio from SuperCollider to FL Studio on MacOS using JackRouter: Downloads | JACK Audio Connection Kit
When you start it, you'll get a little routing/patch window:
Any "jack connectable" application should show up. I imagine Ableton will.
@torotumbo on Windows, my experience is very frustrating. I've used various "Virtual Audio Cable" applications on Windows with the ASIO driver, with occasional success. The last few times I tried it I couldn't get it to work. I fear that I do not have a good solution for Windows.