https://doc-snapshots.qt.io/qt6-dev/qmediaplayer.html

Click on:
Public Functions:
QAudioOutput* audioOutput() const

Current Page becomes:
https://doc-snapshots.qt.io/qt6-dev/qmediaplayer.html#audioOutput-prop

But no link for this under Properties.

At the same time, the documentation for the QML type AudioOutput is missing; the MediaPlayer documentation for the audioOutput property references QAudioOutput* and not the QML AudioOutput type.
https://doc-snapshots.qt.io/qt6-dev/qml-qtmultimedia-mediaplayer.html#audioOutput-prop

""""

This property holds the target audio output. Accepts one AudioOutput elements.

See also QMediaPlayer::setAudioOutput().
""""