Jumpscares are to horror, what slapstick is to humor.
It's a shortcut. Easily seen as bad writing or cheap. You need the right context for players to accept it or be awed by such things. The fnaf type games are all about jumscares. Just like you would expect slapstick in movies with the Marx Brothers, The Three Stooges or other names.
Any favorite examples I could replicate
I have a favorite example for a jumpscare, but you will not be able to replicate it, since your game is a fnaf type game and people will expect such scares.
Eternal Darkness, a horror game on Nintendo no less. The framework story had a character explore a mansion. In one of the rooms, there was a bathtub where you would have that jumpscare show it full of blood. In a literally jumpy camera zoom in. The rest of the game was about various horror topics and tropes, as it was the Lovecraftian type of horror story, but the tool of a jumpscare was bascially not used. It fit in with the sanity aspect, since the bathtub was shown to be empty aftewards.