Qt Application Manager examples fail to scan

Steps to reproduce the issue: try to run the Qt Application Manager example 'animated-windows' on Ubuntu 22.04.4. You will encounter a CMake error.

[cmake] CMake Error at CMakeLists.txt:21 (qt6_am_add_systemui_wrapper):
[cmake]   Unknown CMake command "qt6_am_add_systemui_wrapper".
[cmake] 
[cmake] 
[cmake] – Configuring incomplete, errors occurred!
[cmake] 
[cmake] CMake process exited with exit code 1.
[cmake] 
[cmake] Elapsed time: 00:00.