Complete notmuch search operators / show syntax hints?

[The-Compiler]

Other than the obvious (from:, to:, subject:, tag:), I end up reading man notmuch-search-terms from time to time, to find out how to best search for things. It would be nice if Dodo, after typing / (and potentially also after every space?) would show a completion with the operators supported.

It'd be even nicer IMHO if it could show a little greyed out syntax hint, like e.g. weechat does - i.e. if after typing date:, it would display a greyed out <since>..<until> | <date> or somesuch. Not sure if that's easily possible with what Qt offers though, unfortunately.