You can only insert RSS feeds into the news sources
You need to look for the RSS of the website you want to add.
Some examples:
“https://www.gazzetta.it/rss/home.xml”
“https://feeds.thelocal.com/rss/it”
“https://www.repubblica.it/rss/homepage/rss2.0.xml”
You can find some of the RSS urls in this page