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Power can be drawn from many different sources. Something like an implanted chip would need power from EMF. This could easily be done within a 5G frequency system, but outside of 5G range, I assume it would be off for power conservation or simply just lack of a battery reservoir. So to answer your question, 5G can indeed power devices. As for how useful a chip is—well, that depends on how well the architecture for said chip is developed for the purpose it is meant to serve. And by chip, we're obviously talking circuitry. Good computer architects can make small circuits that do highly specific, but highly optimized tasks. Meaning, these chips could be small enough and power efficient enough to do certain things with only the power of 5G EMFs. I don't think these could be implanted, though, they would be much larger than RFID/PUF circuit chips, which are already pretty big.
