Create RSS feed for "On sale", "Newest" and "Most popular" products

How do I generate an RSS feed to enable my visitors to see the latest “On sale”, “Newest” and “Most popular” products displayed on the storefront? The RSS Feed plugin only shows categories, but how do I do a feed for those main items on the storefront?

Unfortunately there is no such feature out of the box.

Alright. Is there an add-on that does that?

You can look for such a third party add-on at the Marketplace: