Hey @bjorn , I'm sorry for the late reply. I'll try to give some pointers from my experience, if that is still relevent to you, or maybe someone else can find it helpful.
The only way I've come across for connecting Ouster with Unity is through using ROS(Robot Operating System). To connect the lidar to ROS you would need to implement this package. Afterwards there are a couple of different tools I've seen to visualize that data stream in Unity. You can check out ROS#, or for a more complete example, this repo.
Hope this helps, let me know if you have any further questions!