@longtresses, I don’t think that’s ^^^ an instance of a rhetorical question, but even if it were, you wouldn’t label it as such in a piece of writing. In your example, you don’t need to label it at all. We understand this kind of expression as a comment and not a query. You’d just say
“Well, well, well,” I remarked. “Is that Jason’s new blog?”
—We’d understand it the same way as if you wrote, “So that’s Jason’s new blog.”
One kind of rhetorical question would be like this, let’s say in a magazine article: “How do we know when it’s time to say good-bye?” And then the article proceeds to tell us.
Another example is the kind of thing you hear in political speeches and rabble-rousing rhetoric: “Who do they think they are to try to tell us what we can and can’t do? Are we going to let them keep us under their thumbs? or are we going to rise up and show them what freedom means?” Those utterances take the form of a question, but not in order to seek information. The question itself is the statement.