It also bothers me when I have to take the phone out of the cover every time, but I am thinking about whether it would be possible to connect an extension cable so that I don't have to put it in the dock but can connect it to the cable.

Wireless charging doesn't make much sense if you have to put the phone in anyway...
It is charged via the contacts when it is in the station.

The two USB 2.0 ports are likely to be used by most users as ports for connecting a full keyboard and a mouse. In principle, however, a USB stick could also be connected here for data backup or transfer. The USB Type-C port is located inside the base and is the interface to the smartphone. At the same time, the smartphone can be charged via this port, which should be extremely fast thanks to "Adaptive Fast Charging". LAN cables can be connected via the Ethernet port; the maximum achievable transfer rate is 100 MBit/s.

If you look at the product pictures, you will see that it has a micro USB port inside where the phone has to be plugged in, so assume that it will not have wireless charging.
http://www.techradar.com/reviews... <= Here we highlight that it does not have wireless charging.