There is no automatic way to do that being that webcams typically don't have that ability. It would be up to the individual webcam provider to add that info, as I have done here: https://www.windy.com/-Webcams/United-States/Texas/Austin/webcams/1593017214?radar,30.182,-98.683,9
Maybe Windy could add that as a required or optional field when submitting webcams. I agree that adding cardinal direction adds pertinent information to the end user but apparently many providers are just posting their home webcam or are posting highway webcams.
from Austin (but you can see that in my webcam image!)