The New York Times has an API that lets you query “tags” or “topics” and the articles associated with them:

https://developer.nytimes.com/docs/semantic-api-product/1/ov...

The Guardian has similar:

https://open-platform.theguardian.com/documentation/tag

Either or both could be an interesting starting point for something like that. I tried to find something for the BBC and was surprised they didn’t have anything. I would have figured public media would have been a great resource for this.