Tracking Reason in ARFoundation with ARKit

Unity Version : 2019.1.6f1
ARFoundation Version : preview.2 - 2.2.0
ARKit Plugin : Preview 5 - 2.1.0
Device iOS : 12.+
XCode Version : 10.2.1

I have been working with ARKit plugin from the BitBucket repo. Just moved to ARFoundation and it's ARKit plugin. I am working on world tracking & I am able to understand tracking state any point in time, like below

Code (CSharp):

1.  
2. UnityEngine.XR.ARKit.ARKitSessionSubsystem XRSessionSubsystem = (ARKitSessionSubsystem)m_ARSession.subsystem;
3.  
4. //XRSessionSubsystem.trackingState
5.  

However, I would like to know the tracking reason when trackingState is limited

Reference :
https://developer.apple.com/documentation/arkit/artrackingstatereason
From BitBucket Repo :
BitBucket Link

UnityEngine.XR.iOS.ARTrackingStateReason

I would highly if you guys could point me to that direction.

 

Can someone in Unity Team point me in the right direction?

 

Thank you.