I think it would be practical with glass fibre. Two wires/rings for power, and fibre for data. Something like a Mini-TOSLINK, but even smaller. Ideally the plug would be barely thicker than the cable.

Glass fibre is pretty fragile though, it would probably break in the first hour for most people if used like a normal USB Cable.

Just use polymer fibre for consumer gear. Cheaper and more robust.

Can that still transfer data at full speed with reasonable cable length while bent?