iOS Device - Block WhatsApp Native App

Has anyone been able to successfully block WhatsApp Native app on iOS?
We have tried the below methods but these only block browser access but now the native app that is installed on an iOS device(iPhone)

Created a cloudApp control policy and have set WhatsApp Web to block - only blocks browser access
Created url category with .whatsapp.com and whatsapp.net with a policy to block - only blocks browser access

Also, per Zscaler best practice we have SSL inspection disabled for iOS devices. However, we have even tried enabling SSL inspection for WhatsApp cloud app applied to iOS but still does not work.

We have also reviewed both of these posts:

Any assistance would be appreciated.

Thank you