No, this is not possible.
Unfortunately, I had to find out that it is only possible to connect ONE screen at a time.
The description from Digitec is a little misleading:
" ...to provide one HDMI and one DisplayPort connector each for connection to external monitors".
Dell's description reads:
"The USB-C port lets you charge your laptop with up to 90W while connecting ONE external 4K HDR display at 60Hz without compromising on display performance."