How to use magnetic sensor on Google Cardboard?

Development Platform & Builds XR Development
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Look on it, this magnet clicker is kind of hack, it manipulates magnetometer, it is detected is by checking magnetometer tilt when other sensor shows other motion. Problem is you can’t grab raw magnetometer data from UE4 APIs and blueprints, you may try to experiment with processed motion data see if you can detect anything

I also find hints of of support of magnet clicker in Google VR HMD UE4 driver (we talking here about daydream)

https://github.com/EpicGames/UnrealEngine/blob/21c2f157bed5e51a872c48f4ca67fdff6c0c0f28/Engine/Plugins/Runtime/GoogleVR/GoogleVRHMD/Source/GoogleVRHMD/Private/GoogleVRHMD.cpp#L1554

When it detect it, it should raport screen touch at normally impossible position -1,-1, sadly i follow up the code and find that the support for that is disabled right now:

	// TODO: Get trigger event handler working again
	// Setup GVRAPI delegates
	//gvr_set_trigger_event_handler(GVRAPI, OnTriggerEvent, nullptr);

So you need to wait for now, not to mention daydream still sits in github and it not avable in laucher version