This patent describes a lot of devices, one of which is about integrating an induction coil in a MacBook laptop. When your iPhone or Apple Watch is placed on it, you can charge it. Although you will feel disturbed when using your laptop, use an external device. People with monitors, keyboards and mice will find it very useful.
More practically, Apple is also conceiving that when you are on the road, the MacBook's built-in large-capacity battery will charge the iPhone and other devices without booting up or in standby mode.