While Players In View Angle is pretty straight forward, it has the drawback that the resulting hitbox is a cone, wich gives it a really big size on higher range.
You can make a beam-like hitbox with fixed width no matter the range like this:
https://us.forums.blizzard.com/en/overwatch/t/how-to-make-a-beam-attack/633472/4
But it is not beginner level workshop development.