For those who may find it useful, I created a repository that includes snippets to modify the syntax highlighting. I’ll try to update it over time. Anyone is welcome to collaborate: GitHub - juanchiparra/obsidian-syntax-highlighting: A collection of syntax highlighting snippets for Obsidian
PS: I would love it if someone could collaborate with a light mode syntax highlighting. I got used to using dark mode and now my eyes will reject any light mode syntax highlighting, I was unable to choose more than one.