I have started developing for the Oculus Go and as one of the first steps I had to figure out the key mapping. This assumes the MotionController is mapped to the Right hand both in Unreal and within the Oculus Go settings. For the Left hand, just use MotionController (L) instead. I hope it is useful to others.
EDIT: updated to cover the Thumbstick Left, Right, Up and Down events.

EDIT: updated to cover the Thumbstick Left, Right, Up and Down events.
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