Unity OpenXR plugin Application Space Warp needed

Hi, dev.
App Space Warp is such a good feature, but at the current stage I have to switch from OpenXR plugins to Oculus plugins to enable that.
From my understanding, for OpenXR plugins, Meta features are enabled by extending the Unity OpenXR feature and calling function from the UnityOpenXR dll. For instance, Meta FoveatedRendering feature makes the native calls FBSetFoveationLevel, FBGetFoveationLevel, etc.
Without the knowledge of UnityOpenXR entries, I don't know how to get App Space Warp working with OpenXR plugin. However, I do notice that App Space Warp extention has already been included.
Can I expect an official update or is there any API document I can turn to in order to know what are included in UnityOpenXR dll and how to call the native functions.