Can BookyAI build the relationships between my characters from a simple description?

Yes, from version 1.9.22. Open the Codex from the book's page, choose Relations and press "Describe in your words". Write the relationships the way you would tell them to a friend, for example: "Elisa is secretly in love with Tom, who only sees her as a friend. John doesn't know Tom is his son; Maria knows, and John finds out in chapter 9." Press "Build the map". BookyAI turns it into relationships with the feelings on both sides, secrets, who knows them and what changes in which chapter. Read the proposal, then press "Add to the map", or "Discard". A person you mention who has no character card yet gets one. You need at least two character cards to start.