This official position is called "Keeping Tibetan History", which is similar to the current librarian.

Usually I just sort out the books and clean them up, because there are few ancient books, and this job is only available to the royal family. It's a loose official, it's a casual job. The treatment is not so good. Can you eat enough? ....

Historically, both Peng Zu and Lao Zi were engaged in this profession.