It's possible I don't know what I'm talking about, but I believe Dioxus is also targetting cross-platform app development and might be a reasonable fit for you.

It's possible I don't know what I'm talking about, but I believe Dioxus is also targetting cross-platform app development and might be a reasonable fit for you. Here the frontend is written in Rust in their provided UI framework (designed with concepts from the web DOM and learnings from existing web frameworks) and it might be a more familiar approach to a C++ dev who has used Qt or whatever before. I understand it also has experimental support (possibly still under development?) for a servo/verso render engine, which is why I mention it.