Simple dataview query & Metadata Menu

I’m looking to setup metadata menu to pull a dropdown list of notes (internal links) that are from specific folders. Ie. a field called “project” that pulls notes from two folders: “Projects” or “Proposals”.

I don’t have an example because I’m not quite sure what the syntax is for the Dataview query. Sorry if this is a simple question, I have basic understanding of both Dataview & Dataview js but a little stumped on how to combine it in metadata menu and if this is even possible!