Yes, there are. You can find Naruto has Jougan fanfictions on various fanfiction platforms like FanFiction.net and Archive of Our Own. Just search for 'Naruto has Jougan' on their search bars.
Well, you could write a 'naruto jougan fanfic' where the main character has the Jougan but is initially afraid of its power. They could struggle with controlling it and accidentally cause some chaos in the village. As the story progresses, they learn to master it with the help of an old sage who has some knowledge about this rare dojutsu. This could lead to the character becoming a protector of the village in a new way, using the unique abilities of the Jougan.
First, do some research on the Jougan. Know what it can do in the Naruto universe. Then, create a main character who has the Jougan. Decide on their personality, like if they're a shy person who is suddenly thrust into power. Next, come up with a basic plot, such as the character has to use the Jougan to save their village from a new threat.
Archive of Our Own (AO3) is also a great place. It has a wide range of fan-created content, including Naruto fanfictions with the Jougan concept. The tagging system on AO3 makes it easy to search for specific stories.
Anime canon refers to the content that is considered official and part of the anime's storyline. Manga canon is the content that is officially part of the manga's story. Usually, anime canon is based on manga canon but can have some adaptations or additions.
Anime canon might have some changes in visuals or pacing. Sometimes, scenes are reordered or added for better animation flow, but the core story usually remains similar to manga canon.
The main difference is that sometimes the anime might add or omit some details to fit the animation format or time constraints. But the core story and characters usually remain the same.
Anime canon and manga canon can differ in things like plot details, character development, and the sequence of events. Sometimes, the anime might add or omit certain elements to fit the animation format or time constraints.