So the title might not be entirely clear. I was wondering if, while in the editor (classic), it is possible to retrieve a JS object containing all current values of all fields on the current admin screen. Basically the equivalent of what is returned by get_fields(), but run in the client and gets everything on the screen vs database. The goal is to enable real-time previews on a JS frontend by storing all of the pages field values via a storage API such as IndexedDB. Is this currently possible?