You can try going to Chrome settings, then look for the notifications section and disable the stories feature.
Well, first off, open Chrome. Then click on the three dots in the top right corner to access settings. From there, find the 'Notifications' option and turn off the stories notifications specifically. It might take a bit of searching within that section, but you should be able to find it.
To stop the stories in Chrome notifications, one way is to go into Chrome's advanced settings. Sometimes it's hidden a few layers deep. Look for anything related to notifications or content display and disable the stories part. Another option could be to check your extensions and see if any are causing this and disable those too.