Hello,
The USB standard of micro-B plug doesn't allow this, as far as I know. The thing being charged had to be in device mode, but when you connect a device to the phone, it has to be in host mode.
But, many phones can be charged by using a non-standard USB splitting cable where you can apply a charger and still have a device. As this is not standard, you won't find it in the phone user guide.
If the phone is type-C, then it depends on which standards it supports and what is implemented.
Kind regards,
Alban
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