Couldn't see this already and it feels like a long shot but ..
When I am in Gnome, and hit search (superkey) and type the name of a topic or note, it would be great if the note was visible (as a file metapor) and Joplin launched to view it if successful.
I have notes in random text and odt files AND notes in Joplin, so I do sometimes end up searching twice.
Perhaps this is a Gnome extension? Anyway would be interested as to feasibility!