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cannot
The interface is different and cannot be used directly.
The Apple Watch has the ability to charge wirelessly, making it the first Apple mobile device with wireless charging. The Apple Watch uses a MagSafe-style wireless charger. It magnetically attaches to the back of the Apple Watch and is then charged inductive. Although it works in the same way as existing wireless chargers on the market, wireless charging can still bring a lot of convenience for a device that may need to be charged every day.
one
If it is a line charge, it can not be, because the charging interface of Apple and other mobile phones is different, so the data cable can not be inserted.
two
If you use wireless charging, as long as Apple supports reverse wireless charging and the phone to be charged supports wireless charging, you can charge it.