Can't import qtquickcontrols2 from Qt build

I have my Qt 6 sources in ~/dev/qt-dev, and the top-level build directory is ~/dev/qt-dev-debug. When I open ~/dev/qt-dev/qtquickcontrols2/CMakeLists.txt and then try to import the build from ~/dev/qt-dev-debug/qtquickcontrols2, I get this error message:

This worked with qmake.

If I open qtquickcontrols2/CMakeLists.txt in Creator, the build directory will default to /home/mitch/dev/qt-dev/qtquickcontrols2/../qtquickcontrols2-qt_dev_debug_no_asan-Debug, which is in the sources. My intention is to do a shadow build in my existing top-level build directory.