Feature Request: Keyword Filtering

It would be awesome, if you could add a blacklist and whitelist of keywords to the addon. Say you want a feed, where a certain keyword does not appear, you could type blacklist='some word'. Or the other way around, where you want a feed where only specified keyword(s) appear, you could type whitelist='some word'.

https://www.ads-software.com/plugins/wp-rss-retriever/