What are the 4 pads underneath the USB for?

Under the USB-A port labelled 1, there are 4 pads/traces exposed, but they’re not annotated on the image. I was curious what they were for, and hoping that they were alternate pads for VIN that I could solder my UPS onto.

The definition of these 4 pads is VCC5V/GND/LineL_OUT/LineR_OUT; This is a reserved feature for now.

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