You can include the content of RSS newsfeeds in wiki pages using the <rss> tag.
To include a newsfeed with the default layout, use
<rss max="5" date="M d">https://planet.opensuse.org/global/rss20.xml</rss>
For details about the available options, have a look at the upstream documentation.
Note that <rss> does not follow redirects, so make sure to use the correct URL.