VR motion controller input mapping is missing A/B and X/Y Buttons for Vive and WMR

Hello, I am expanding on the VR Template in UE 4.27 and tried to map the A/B and X/Y buttons on the right and left motion controller respectively. The problem is that (at least with the default OpenXR plugins) the Vive and WMR devices have no such buttons in the list:
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I have found the mappings for the Valve Index and Oculus Touch controllers
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Your suggestions are appreciated.

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Bump, I’m trying to set my inputs and I don’t understand how to set the ABXY buttons for VIVE and WMR, everything else works

Do people generally use the trackpads on those controllers as buttons? Seems a bit odd but it doesn’t look like there’s any other options