It looks like Android XR supports the OpenXR standard.
https://unity.com/blog/how-to-build-for-android-xr-resources
https://developer.android.com/develop/xr/openxr
https://dev.epicgames.com/documentation/en-us/unreal-engine/developing-for-head-...
Does any of this imply that the Samsung XR could already be supported with what's available now?