I think there's a few novels . . . There's another "VS JOJO" one that's Purple Haze Feedback, someone started translated that on tumblr but I guess maybe they dropped it: [link]
(I believe they're going to be creating more VS JOJO ones.)
"The Book - Jojo's Bizarre Adventure 4th Another Day" is a part 4 one and is being translated by someone who's done a bunch of translations for the scanlations. <3 You can read all they've done here: [link] (I'm not sure if it's technically a VS JOJO one . . .)
I think there's another unannounced VS JOJO one and there might have been a much earlier one about Mista but I just remember someone mentioning that once and I don't know how factual it was or anything.