Interesting question!

If I’m not mistaken, charging works by the voltage potential difference of the connected devices. Think of a wall outlet, having the highest voltage in your house probably, vs a phone out of charge with effectively 0 voltage. The high potential will move towards the low potential, pushing power to the low voltage device.

The mechanism requires a specific difference in voltage to work. Most electronics have very lower voltages, relatively speaking. So for your idea to work, you’ll need to find a device that doesn’t require a high voltage difference, and either a series of connected and fully charged devices or an electronic with high voltage. I think it doesn’t exist because they won’t be functional or unsafe if they do, but I’m not sure as I’m not as expert. I just took university electricity classes so there’s a good Chance I’m wrong.

I hope an expert answers though because I’m curious now too!