The Huawei P20 Pro cannot be charged inductively by default. The corresponding technology is not on board. However, you can still use the inductive charging technology with the help of a little trick.
How this trick works exactly is explained here:
We use a kind of adhesive pad, an induction pad, which is glued to the back of the Huawei P20 Pro and connected to the USB Type C connector.
Advantage:
You can charge the Huawei P20 Pro inductively
Disadvantage:
The USB Type C port is occupied, not compatible with metal sleeves
The pad itself costs only a few Euros and can be purchased Amazon:
An inexpensive and probably the only option if you want to charge your Huawei P20 Pro inductively.