Right now the code needs to be written like this:

qt_ifcodegen_extend_target(libIc_ch3
    IDL_FILES ../instrument-cluster.qface
    PREFIX CLUSTER
    TEMPLATE frontend
)
qt_add_qml_module(libIc_ch3
    OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/../imports/${CLUSTER_URI_PATH}"
    URI ${CLUSTER_URI}
    VERSION ${CLUSTER_VERSION}
    RESOURCE_PREFIX "/"
    IMPORTS QtInterfaceFramework/auto
)

Instead a convenient cmake function could be added which does most of the things automatically:

qt_ifcodegen_extend_qml_module(libIc_ch3
IDL_FILES ../instrument-cluster.qface
PREFIX CLUSTER
TEMPLATE frontend
)

which does the same as above automatically but also allows to change qt_add_qml_module options