I would need an adapter to use this on my 2019 R Line as it has the old type USB slot.
Could try this, available from MobileFun and Amazon - Standard USB one end, and USB -C at the other.
Be sure to get a Data cable, not just a simple charging cable.
Huawei P20 USB-C to USB 3.1 Fast Charge Data Cable
Charge and sync your USB-C compatible device quickly and conveniently with this official cable in white for your Huawei P20.
Compatible with Huawei P20