@kritig Welcome to the Developer Forum. I recommend using XRI's input and event's directly.
https://docs.unity3d.com/Packages/com.unity.xr.interaction.toolkit@2.2/manual/ui-setup.html
You can also use a standard 3D Canvas with the UI Button component. (GameObject > XR > UI Canvas) . Then use the standard UI components from Unity.
These instructions might help you get started.