I was in the process of doing that for my Soul EV, but kind of lost interest, because I can't seem to find the time to continue the project.
Needless to say, purchased a fog light kit from ebay.
https://www.ebay.com/itm/Xenon-Halogen-Fog-Lamps-Driving-Light-Kit-Pair-for-2015-2019-Kia-Soul-EV-/152904487481
Then I went to my local plumbing supply store and purchased 2 sets of threaded PVC piping. (I think it was 3 inches in size)
https://www.amazon.com/Genova-Products-80430-ABS-DWV-Adapters/dp/B001AUEH9O/ref=mp_s_a_1_30?dchild=1&keywords=3+in+pvc+pipe+black&qid=1618766517&sr=8-30
Then I drilled some holes to attach the lamps to he outside of the PVC piping, and that's as far as I got...
Next step would be to install the lamps in position and install the light switch and wiring.