Hi Abou and welcome to the Couchers forum. This is an interesting idea.
In fact, CS tried to do something similar with the idea of “local favorites,” which as far as I know is still being tested and only available for verified members. People in each location choose some of their favorite spots and can write about why, and the site compiles that info for people who came to the “explore” section of the site. Of course, like many CS features, this was only ever available on the website, not the app.
I think something like this is useful, but I also feel that other services already do it well: TripAdvisor, Google Maps, and the like. It’s possible that CSers have special and unique advice to offer, though.
A “local guide” could maybe fill the role that a CS ambassador did, but fleshed out a bit more so that they send an automated message to people looking for hosts in that area or have a greeting on the page for that location.
Anyway, welcome again, hope to hear more ideas from you in the future.