One solution is to use virtual routing software e.g. Voicemeeter Banana, and select this as your system's output device. This will then interpret wwise's multichannel output and send it to the discrete analogue outputs of your interface.
CRUCIAL part of the process is to go into control panel and set Voicemeeter to be surround output. You potentially need to then change some configuration with your interface setup, but when you play something out of wwise, you can check in voicemeeter if there are multiple channels of audio as expected - from here it's a case of making sure your interface is working correctly.
Some further clues that could be helpful on this blog post.