You can use Xiaomi's wireless charger.
Because Huawei's wireless charging protocol is always compatible with Xiaomi's wireless charger charger, because Xiaomi's wireless charger has been tested before leaving the factory and can enter most of the wireless charging protocols, it can use the wireless charging function for Huawei mobile phones, and can achieve a relatively high charging power.
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Huawei p40 wireless charging phone case can be charged with Xiaomi 20W car wireless, Huawei Mate 40 Pro standard charger support 11V\/6A or 10V\/4A or 10V\/2.25A or 4.5V\/5A or 5V\/4.5A or 9V\/2A or 5V\/2A output, support 50W Huawei Wireless Super