Just to make sure I understand correctly that there is absolutely no way to add these for now right?
The latest thread I found around this topic is about character input; in my case it’s more to do with actual alternative readings. Saw 静寂 【しじま】in the wild, and wasn’t quite sure how common that reading is, but it would be nice nonetheless if you could add it, or similar alternative readings, in the future (say, after you’re already familiar with the usual Onyomi WaniKani tries to reinforce)!