The first link you provided shows that the browser
dimension is set as AppleNews
for those visitors (I've never used Apple News before, but I'm guessing it's an in-app browser).
This gives you a few options:
- Use a secondary dimension of
Browser
with an advanced search for AppleNews
in your Acquisition report.
- Create a segment where the
Browser
matches AppleNews
to make it available for all reports.
- Create a find/replace filter when the
Browser
matches AppleNews
to change the acquisition data itself (source/medium). You'll want to be careful with his because it permanently alters your data!
The other thought I had is that maybe it's possible to use UTM query strings only when submitting to RSS? If the data is scraping your website you could programmatically update the RSS URL to include UTM parameters to track the source/medium that way (this may have varying success because of other scrapers outside of Apple News).
If you manually submit to Apple News, you could manually UTM tag your URLs so the source/medium is forced to Apple News.