[mariusor]

Isn't there a way to integrate this type of info into the actual search engine? Ie, search for type:rss or atom and return the links to the RSS feeds?

[edit] I mean, to have it closer to what OP showed.

[8organicbits]

I know the Google search console lets you upload a site map, which can be an RSS feed, so the information is readily available. I suspect Google isn't incentivised to promote RSS, especially after they killed Google Reader.