CMake using qt_add_qml_module: how to handle dependency on QtMultimedia (or other Qt non-core module)

CMakeLists.txt

cmake_minimum_required(VERSION 3.16)

project(minimalSynthesizer VERSION 0.1 LANGUAGES CXX)

set(CMAKE_AUTOMOC ON)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(Qt6 6.2 COMPONENTS Quick Multimedia REQUIRED)

qt_add_executable(appSynth
    main.cpp
)

qt_add_qml_module(appSynth
    URI minimalSynthesizer
    VERSION 1.0
    QML_FILES main.qml
)

qt_add_qml_module(Synth
    URI Synth
    VERSION 1.0
    SOURCES
        Synthesizer.h Synthesizer.cpp
)
target_include_directories(Synthplugin
     PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}
)
#target_link_libraries(Synthplugin
#    PRIVATE Qt6::Multimedia
#)

target_compile_definitions(appSynth
    PRIVATE $<$<OR:$<CONFIG:Debug>,$<CONFIG:RelWithDebInfo>>:QT_QML_DEBUG>)

target_link_libraries(appSynth
    PRIVATE Qt6::Quick Qt6::Multimedia
    Synth
)

main.cpp

#include <QGuiApplication>
#include <QQmlApplicationEngine>


int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    const QUrl url(u"qrc:/minimalSynthesizer/main.qml"_qs);
    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                     &app, [url](QObject *obj, const QUrl &objUrl) {
        if (!obj && url == objUrl)
            QCoreApplication::exit(-1);
    }, Qt::QueuedConnection);
    engine.load(url);

    return app.exec();
}

main.qml

import QtQuick

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")
}

Synthesizer.cpp

#include "Synthesizer.h"

Synthesizer::Synthesizer(const QAudioFormat &format, QObject *parent)
    : QObject{parent}
    , _audioFormat(format)
    , _audioSink(nullptr)
{
}

Synthesizer::~Synthesizer()
{
    stop();
}

void Synthesizer::startPull(QIODevice *device)
{
    stop();

    _audioSink = new QAudioSink(_audioFormat);
    _audioSink->start(device);
}

void Synthesizer::stop()
{
    if (_audioSink == nullptr)
        return;

    _audioSink->stop();
    _audioSink->deleteLater();
    _audioSink = nullptr;
}

Synthesizer.h

#pragma once

#include <QObject>
#include <QtMultimedia/QAudioFormat>
#include <QtMultimedia/QAudioSink>

class Synthesizer : public QObject
{
    Q_OBJECT

public:
    explicit Synthesizer(const QAudioFormat &format, QObject *parent = nullptr);
    virtual ~Synthesizer();

    void startPull(QIODevice *device);
    void stop();

private:
    QAudioFormat _audioFormat;
    QAudioSink *_audioSink;
};