I've also found this one which seems to say it will do the job:
USB C Docking Station Dual Monitor HDMI for Dell HP, Thunderbolt 3/4 Dock Multiport USB C Hub Quad Monitor Docking Station to 2 HDMI,Displayport,VGA,Ethernet,5 USB,PD,SD/TF,3.5MM for Lenovo,MacBook
It lists the Dell "Laptop 5590" and mine is the Inspiron 5580 - I guess this will again be a try and test?