Get aspect ratio of AR Foundation Feed?

Hello everyone, i am looking to get the accurate aspect ratio of the camera feed, but the returned frame does not return the values i expect.

My iPhone 11 Pro Max reports that the resolution is 1920x1440, which is fine for the image, but it does not represent how i need the image to look when wanting to save it or present it in a custom way.

How can i reliably get the intended aspect ratio of how the frame is supposed to be presented?

The following code only returns the resolution of the AR feed in an unscaled format:

// Get the latest frame and print the size
XRCpuImage frame;
while(!_cameraManager.TryAcquireLatestCpuImage(out frame))
     await Task.Delay(50);
          
Debug.Log(frame.width);
Debug.Log(frame.height);

A visualization of the issue:

Frame returned straight from AR Foundation:

Same frame scaled to 16:9:

Still haven’t found a solution to this, anyone?