Linux is rarely a porting issue for C++ or python: https://wxwidgets.org/

Static linking libraries for MacOS or Windows is contaminated by GPL/LGPL code, and this is why wxwidgets excludes the disclosure requirement.

Also, if you are looking for a VueJS cross-platform GUI framework for most Desktop and Mobile platforms (modern MacOS hardware and developer account is a requirement):

https://github.com/quasarframework/quasar

Qt5/Qt6 frameworks sooner or later cause more problems than they solve, and require a lot more maintenance/support.

Best of luck =3