Yes, I built Markup alongside clinicians within the NHS (they would provide feedback, feature requests, etc.). However, they use a locally hosted version with a standalone sequence-to-sequence model I trained on medical entities; they don't send patient data to third parties.
You can check out some of the clinicians using Markup (+ published papers) in the comment section of my PH release, https://www.producthunt.com/posts/markup-document-annotation