At first glance, it looks like at least a few events are relevant to get a rough idea what the user is looking at, without revealing too much from a privacy perspective:

QAccessible::ForegroundChanged, DialogStart/End, ObjectShow/Hide

https://doc.qt.io/qt-6/qaccessible.html#Event-enum

My assumption so far is that the telemetry plugin or QML module could implement QAccessibleBridge to receive those events, and send them on to Snowplow somehow.