Feature Request: First move leaving the opening book

I'd like a feature to show me the first move leaving the opening books in the Analysis board. This would help me to improve my opening skills.

This is already an issue on GitHub: github.com/ornicar/lila/issues/1812

Though it's unclear whether or not it will ever become a feature. Cheers!

What you can do is open a study. Every game you play you add to one single chapter until you go out of book. On that move you add what the correct move should be and move on. Delete excess moves so the study isn't a bunch of games just the openings of the games.