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Ok I'm not sure if everyone is aware but on top of QC 4 you can use USB PD for your Xiaomi devices and yes it works with USB PD 3.0 chargers. I'm not sure how long Xiaomi have been doing this but I noticed it when I was charging my father's Mi6 with a Google Pixel charger and I charged a Mi Mix 3 with my Laptop's charger (Mi Notebook 13 1st gen) So far the devices I tested it on was with Mi6, Mi8 and Mi Mix 3. If anyone would like to add more information please comment below.