Meta Quest pro openXR extension

I am writing an app on Quest Pro, and I would like to achieve the foveated rendering. To do so, I need to enable the XR_Meta_eye_tracked, however, it seems blocked as the reply is the default (0,0). May I ask for more instruction or some demo code?

Start with the XR_Meta_eye_tracked extension and the Quest Pro foveated-rendering setup described in the report; no source file or test is identified. Reproduce the default (0,0) response through the relevant OpenXR entry point, then document the required setup or provide a working demo and verify the eye-tracking result.

Written by the indexing model from the issue text.