Allow users to leave written reviews without leaving the app?

Is there a way to do the above?
I'm aware that we can allow users to leave starred reviews in-app without having to go to the App Store, and that the documentation for SKStoreReviewController.requestReview() says that it allows us to "ask the user to rate or review your app" (suggesting 2 separate activities, I'm assuming leaving a starred rating or a written review). In debug mode I can trigger the popup for leaving a starred review, but the "Submit" button is greyed-out--after the user submits a starred review, are they able to write a review after? Is that how in-app written reviews are done? If so, is there any way to test this in debug mode?
Any help would be appreciated.