For individual posts, the Extra Feeds plugin will add code into the
<header>of one’s page to provide feed readers that have built-in discovery mechanisms the ability to find the additional feeds provided by WordPress for all the tags, categories, and other custom taxonomies that appear on any given page.
👍 dshanske/extra-links
Adds extra feed links to a page based on tags, taxonomy, and author. – dshanske/extra-links
As Chris Aldrich explains: