Apple is working on a new yet to be announced external battery pack for the iPhone 12 range. The accessory will use Apple's MagSafe magnetic adapter tech to attach to the rear of an iPhone and charge wirelessly over the Qi protocol.
https://www.notebookcheck.net/Apple-working-on-MagSafe-wireless-power-bank-charging-accessory-for-iPhone-12.521727.0.html