How to keep some data only local when using Core Data + CloudKit NSPersistentCloudKitContainer?

I'm using Core Data and NSPersistentCloudKitContainer to sync the data using iCloud. There is some data that I want to just be local to the device, how would I make a CoreData model that is not synced with the cloud?
How to keep some data only local when using Core Data + CloudKit NSPersistentCloudKitContainer?
 
 
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