CoreMotion magnetometer in WatchOS

Hi everybody,
Thanks for review my ask. I'm developing an app for WatchOS. I want to detect a magnetic field near to iWatch but when ask to isMagnetometerAvailable always response false.
In iOS I've been able to detect a magnetic field save data from this to analyse.

My iWatch has the compass and I thought that it was possible to detect a magnetic field like this app.

Is possible in WatchOS detect a magnetic field with magnetometer?

Did you come up with some solution? I'm also trying to get magnetometer data on AppleWatch 6 and 7 but isMagnetometerAvailable is false. However, an app for collecting sensor data " SensorLog " can access it.

CoreMotion magnetometer in WatchOS
 
 
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