@feditips well, I think discoverability is important and one way to make it happen is that a plugin like this offers ways to show visitors they can interact via ActivityPub. Seems like the latest version does already have that part covered per what @pfefferle said.
An even better way might be to have this in the browser in a similar way to how you used to see the RSS icon on the browser address bar at least in Firefox back when RSS was in vogue and how the Streetpass extension does it (https://streetpass.social/) but I doubt we are going to see a (or maybe rather the) major browser support this as a built-in feature anytime soon.