FloFlo is an SRS site by community member Raionus. He curates word lists (somehow… magically?) from light novels and some manga for us. It looks at your WK level (if you want it to) and will only show you words that are new to YOU. (And you can set the threshold of how many times the word appears in the book with “frequency”.)
It’s pretty great!
Unfortunately, you can’t bulk-add the whole book (or what you’ve made with your threshold) in one go. I’m hoping that feature comes in the future… ( @Raionus hint hint?)
EDIT: You can read more about it in this thread, with how-to-use it help, etc. (Back up) Floflo.moe - A WK-friendly website for reading