There are a few users of Qt in this forum.

They have just released a toolchain for MCU's, of which the Teensy4 Beta (i.MX RT1050) is supported.

https://www.qt.io/blog/qt-for-mcus-1.0

I can imagine if this ever became an option on the Teensy4 platform, with the multitude of LCD's and drivers, it would open up some new and exciting projects.

I'm hoping to have a closer look over the break, but if anyone has any insight I'd be interested see everyone's thoughts.