Title explains this–is there a way to get this statistic in my Zwift display or can I extrapolate it from other information?
You can take the watts and devide it by your weight in kg.
So if you do 200w and weigh 75kg then your w/kg is 200/75= 2.67w/kg.
Zwift shows you your w/kg in the rider list. There is no other location within the Zwift UI that I am aware you can have display that.
However, if you are running the companion app IIRC you can click on the watts in that app and it will switch to display w/kg and not raw watts.