I tried inserting the Google News URL directly into the RSS Feed and it always gave me an error.
After some searches on Google, I found this quick way.
#1. Suppose you enter a topic on Google News, for example: Singapore
#2. Google News will redirect you to a page with URL like this
#3. We will change it to this URL format
https://news.google.com/rss/topics/{id}?hl={lang}
{id} is this part
#4. We will have this URL
https://news.google.com/rss/topics/CAAqIQgKIhtDQkFTRGdvSUwyMHZNRFowTW5RU0FtVnVLQUFQAQ?hl=en-US
#5. Paste it to the RSS Feed Widget
#6. Result
