OculusGoScreenMirror for Unity
update: this could be a better option if you don't want to do anything other than display the oculus screen: https://pixvana.com/sharing-your-oculus-go-screen-on-your-laptop/ - note: It shows a larger lag time than this solution but doesn't impact the oculus as much.
The command from the link, assuming your VLC app is at /Applications/VLC.app/Contents/MacOS/VLC :
./adb exec-out "while true; do screenrecord --bit-rate=1m --output-format=h264 --time-limit 180 -; done" | "/Applications/VLC.app/Contents/MacOS/VLC" --demux h264 --h264-fps=30 --clock-jitter=0 --network-caching=100 --sout-mux-caching=100 -
This shows very poor fps on the receiver side (1 frame receieved per 27 frames on the sender side) and there is a 20ms and 30ms delay every now and then on the sending side between frames for the jpeg conversion and ReadPixels() computations, but at least is enough to introduce a new user to something new/complicated. I'm very open to contributions and would love suggestions for speed improvements. Unity hasn't opened the AsyncGPUReadback API for android yet but that should help the fps when they do.
Usage
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In your screen receiver local computer unity project (which should work on mac, pc, linux): place the UdpScreenReceiver.cs object on any object and drag a rawimage gameobject to its public ImageDisplay field
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In your Oculus unity project: place the SendUdpFrames.cs on your camera gameobject and set the local computer's IP address to its public IP field
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build on the oculus and press play or build and run on the receiver side