Yes, it's possible in the realm of fan - created crossovers. We can imagine a scenario where all kinds of fictional universes collide and Harry Potter stumbles upon Jurassic Park fanfiction. It could be in a wizarding library that has some sort of magically - obtained Muggle literature section.
Sure, why not? In the world of fanfiction, anything can happen. There could be a magical device that allows Harry Potter to access different fictional works from other universes. Maybe Hermione has found a way to use magic to import such fanfictions into their world. It's a fun concept to think about and there's no real limit to the imagination when it comes to crossovers like this.
It is possible if we consider the idea of multiverse theory in a fictional sense. Just as there are different magical worlds in the Harry Potter universe, we can think of there being a way for Harry to access the fan - created world of Jurassic Park fanfiction. It could be part of a new adventure where Harry discovers new types of stories and has to deal with the different concepts and ideas presented in the Jurassic Park fanfiction.