Philosophy of Journalism?

Has anyone ever thought about the philosophy of journalism, or lack thereof?

I'm not just talking about particular or industry-standard ethics (that is applied ethics). I'm talking about a bona fide applied philosophy where epistemology, ethics, ontology, aesthetics, and the like are discussed in the context of journalism in order to understand various notions within journalism.

What are journalists obligated to do? What is "news"? How do we know, if we can, that what we report is true; what does "true" mean in this context? What is a journalist?

It seems like many of these questions are taken for granted. I know there are some books that somewhat touch on these questions, the Elements of Journalism being one of the more famous examples, but I don't find them as philosophy of journalism books as they are journalism books that touch on philosophy