One great 'Spiderman and MJ Fanfiction' is 'A Day in the Life'. It beautifully captures the relationship between them, showing MJ's understanding of Peter's double life. The story has a lot of heartwarming moments.
Fanfiction about Peter and MJ in the context of Spiderman and Spiderwoman often plays with different timelines and universes. For instance, there could be a fanfic set in an alternate universe where MJ has superpowers too. This would change the dynamics of their relationship completely. Writers can also explore how Peter and MJ interact with Spiderwoman in these fictional stories.
In the traditional Spiderman comic arcs, MJ remains alive. However, there might be alternate universes or special storylines where her fate differs, but in the core continuity, she survives.
Sadly, I can't tell you the author of this graphic novel. It could be an indie creator, in which case it might be harder to find information about them. Or it could be someone relatively unknown in the mainstream but well - known in a specific niche related to cancer awareness or graphic novels.
I'm not entirely sure as there could be many different graphic novels with that title. It might be about a character named MJ who is dealing with cancer. Maybe it tells the story of their journey through diagnosis, treatment, and how they cope with the illness in a graphic novel format.
A great place to start is Archive of Our Own (AO3). It has a vast collection of fanfictions, including many about Spiderman and MJ. You can easily search for specific tags or ratings to find what you like.
A common theme is also the idea of support. MJ being there for Peter during his superhero battles, and Peter relying on MJ's strength and understanding. And of course, the theme of adventure. Sometimes MJ gets dragged into Peter's adventures as Spiderman, and how they face those together.