Google VR with AR core or AR kit


I am trying to mix Google VR with AR core(Android), developing on MAC with Unreal Engine 4.20.

I have tried with launch in the editor to deploy on my android.

It seems that AR core do not work when Google VR is on.

Do I have to use console command like ‘stereo on’? after starting AR?

VR turn on -> AR turn on?
AR turn on -> VR turn on?

Do I need to package installer? not with editor launch?

Any references I can use? There are no related things on google or youtube. This feature is enabled on Unity but I cannot found any ref on UE.

Any comment will help.