Is it possible to observe the iOS Contacts app or the contacts store of a device using key-value observing?

Is it possible to observe the iOS Contacts app or the contacts store of a device using key-value observing? How would I find out? I can't find information on it when I do a search on Google.

Is it possible to observe the iOS Contacts app or the contacts store of a device using key-value observing?
 
 
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