It may be worth looking at qmetaobject[0] which lets you use Qt/QML from Rust. Whatever you can do in QML you can do with qmetaobject, and writing new Qt stuff can be done with some annotated Rust code. I'm using it in a personal project and quite enjoying it, the lack of C++ tooling is a joy not to be understated. I believe it's from the same author as Slint.

[0]: https://crates.io/crates/qmetaobject