The goal is to use REST to pull content into a homegrown mobile app. I'm able to run simple API calls like this and get results:
https://xxx.sharepoint.com/sites/xxx/_api/web/lists/getbytitle('Site Pages')/items?$select=Title
But I can't figure out how to get the full content of news posts, which I believe is in a container named "CanvasContent" i.e title, author byline, first published date, body content, banner image thumbnail, etc.