Hi there,

Currently, it is not possibly to achieved this as those RSS feed are handle by joomla itself and it is based on the browser css itself as when you viewed them on chrome, it will shown differently than what you viewed on Firefox browser. And it is not possible for your to do modifications on it, unless, to add something else in it. Please refer given URL below.

https://joomla.stackexchange.com/questions/14700/change-the-elements-displayed-on-the-rss-feed

Thanks for your understanding.