Let's be honest: It's more than likely that there's a supers supplement for Night Shift: VSW on the horizon some day in the future. Here's the trick, though: you don't really need it to do supers with the game as it stands. You could do a street level supers game with NS:VSW exactly as it sits, and you'd still be well within genre. Look at TV shows like Arrow or Batwoman on the CW or the Netflix Marvel shows for examples of how street-level supers can be dark urban fantasy at its finest.
Hell, consider Blade as an example of how the superhero genre can be mixed with horror. It's certainly not outside of the wheelhouse of Night Shift to experiment with superheroic games, particularly if you keep it at "street level" abilities.
Let's check out the easy ways you can do superheroes with Night Shift: Veterans of the Supernatural Wars