How to turn a webpage into an RSS feed using CSS selectors and Feed Creator

We charge for the self-hosted version, but you get the full PHP code to host it yourself under the AGPL license when you purchase.

There are other opensource alternatives you might be interested in too [0], [1] and [2]. For rss-proxy you do not have to deal with selectors, though the feed quality won't be as good as the one OP suggests.

[0] https://github.com/damoeb/rss-proxy/

[1] https://github.com/RSS-Bridge/rss-bridge

[2] https://github.com/DIYgod/RSSHub