There's a fairly small but still going fandom for a 1950s gay romance novel called The Charioteer which is like this. I think it's because a) the book itself is pretty good about character development and expects the reader to be paying attention to the stuff the unreliable narrator is looking at without really seeing it and b) most of the fans seem to be mature adults--the fandom doesn't seem to attract a ton of teenagers (maybe because it's an older book? idk.)
You can also find some of this in the Les Mis fandom, surprisingly--I think in that case the people creating it are the ones who are fans of the novel first and the musical second, so they have a much better grasp on a lot of things about the characters and the story. You have to work pretty hard to find it there though, since it's vastly outnumbered by grammatically deplorable modern AU fic written by 15 year olds about their one-dimensional OCs, who happen to share the names of the Les Mis characters, making out with each other with some terribly-handled social justice issue as the backdrop. Not that I am bitter.
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You can also find some of this in the Les Mis fandom, surprisingly--I think in that case the people creating it are the ones who are fans of the novel first and the musical second, so they have a much better grasp on a lot of things about the characters and the story. You have to work pretty hard to find it there though, since it's vastly outnumbered by grammatically deplorable modern AU fic written by 15 year olds about their one-dimensional OCs, who happen to share the names of the Les Mis characters, making out with each other with some terribly-handled social justice issue as the backdrop. Not that I am bitter.