I don't really see how this would make sense or even be possible purely from the frontend, I think you'd need to modify the typeahead service unless I am misunderstanding the requirements.
Exactly and with any modern frontend a solution "purely from the javascript console" can only be a terrible DOM hack. The actual code driving the UI is encapsulated from the global variable namespace that you can potentially modify from the console and in any case is typically transpiled as well.