Retrieving data from the "XR_META_performance_metrics" OpenXR Extension with Unity

I'm interested in reaching into the "XR_META_performance_metrics" OpenXR extension and retrieving the motion_to_photon_latency metric, through Unity (not necessarily but I assume that it would be the simplest way?).

However, I'm unsure as to how I can do that. I'm able to access all enabled extensions in Unity through OpenXRRuntime.IsExtensionEnabled(extensionName) but I can't seem to figure out the next step of accessing info related to the extension.

Any help / direction towards something would be appreciated! Thanks!