Huawei introduced a new feature known as reverse (or inverted) wireless charging with the Mate 20 Pro. It means that the new flagship can be used as a charging pad for other devices with compatible technology. However, Android Authority found it to work very slowly for a Pixel 3 in comparison with its own chargers.
https://www.notebookcheck.net/Huawei-Mate-20-Pro-s-reverse-wireless-charging-was-tested-and-found-to-be-extremely-slow.361056.0.html