Apple has Nearby Interaction framework to access the UWB chips in the iPhone 11 and 12. It is fairly trivial to get measurements between two iPhones.
The intention is for tag makers like tile to be able to use the API so there is promise in getting it to recognize a Decawave chip
The Framework:
https://developer.apple.com/documentation/nearbyinteraction
PS. The bluetooth BLE stack is accessible thru Apple iOS frameworks without licence. For example any super cheap bluetooth product bought anywhere will connect to an iPhone. Connecting a physical wire to the iPhone lightening port does require the security chip.