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Assuming that the Raspberry Pi 4 is attached as a slave to emulate different devices/gadgets using the USB OTG functionality available on the USB-C port: Is it possible to power the Raspberry from another power source at the same time?

Put differently: Is it possible to attach one USB/non-USB device (like a power bank or battery) which powers the Raspberry while another USB device is acting as the USB host (like a smartphone or PC)?

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Yes, it is possible to power the Raspberry Pi from another power source at the same time. You can use a POE (Power Over Ethernet) hat or power it by the +5V and GND GPIO pins. The latter has the disadvantage that it isn't protected against overload. Or you can try to do it yourself an Y-cable How to make a splitter cable for the USB2 OTG port on the RPi 4B?.

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