I think Slint is getting pretty close to that these days: https://slint.dev/

No quick and easy drag&drop just yet, but IDE support for live preview rendering makes it come pretty close. I do long for the Visual Studio GUI design days, but things aren't as barebones anymore as they used to be in open source Rust land.

WYSIWYG designers seem convenient, but they're not that popular anymore for a reason. Writing UI in code is more flexible, easier to maintain, and works better as projects grow.