Podlite 2.0, released in May, added a way to mark sensitive data in a document: personal details, passwords and the like. Podlite is a semantic markup language, so to be clear: this marks the data, it does not protect it. As far as I know, it is one more thing no other markup language has.
In Podlite Desktop a marked fragment is covered with a bar and opens only when the cursor is on it. So now I can share the editor screen on Zoom with less worry.

The cursor opens and closes a password in
G<>; :masked is added to the block, and the preview keeps it covered
By the way, since version
0.9.0
Podlite Desktop is also a Markdown editor: .md files open as native documents.
Markdown is part of Podlite, so this was the natural next step for the desktop app.
Download it here.

A Markdown file in Podlite Desktop: highlighting and preview