qmake projects can no longer tag java classes with 'static_init_classes'

I am porting a qt5 android project to qt6. The project uses qmake, and builds a patched version of qtconnectivity and deploys it to the device.
When I try to connect to a bluetooth device, the app crashes in QtBluetoothBroadcastReceiver.onReceive(...). 

public void onReceive(Context context, Intent intent)
    {
        synchronized (qtContext) { // crashes here because qtContext is null
            if (qtObject == 0)
                return;

            jniOnReceive(qtObject, context, intent);
        }
    } 

In Qt5, AndroidManifest.xml supported the following metadata:

<meta-data android:name="android.app.static_init_classes" android:value="-- %%INSERT_INIT_CLASSES%% --"/> 

which would result in an entry like this in libs.xml in the generated apk:

<string name="static_init_classes">org.qtproject.qt.android.bluetooth.QtBluetoothBroadcastReceiver</string>

'QtActivityDelegate::loadApplication(...)' would then call 'setContext' for modules that don't need/have setActivity, such as QtBluetoothBroadcastReceiver.java.

After Qt6.2, this is not happening, as 'static_init_classes' metadata is no longer supported in AndroidManifest. (https://doc.qt.io/qt-6/android-manifest-file-configuration.html).

How do I tag a java class like QtBluetoothBroadcastReceiver with 'static_init_classes'?