In your last image of the object spy, the object name qt_scrollarea_viewport has a button with three dots on it. Click that button and it will drill down. There may be several levels but look inside there for the other fields.
I'm looking for a suitable field with the three dots in a square that shows you can drill down and maybe find the entries that you need.
I can't tell from the middle screenshot if they have the square, but the childrenRect and childrenRegion might be a place to start. Also take a look in NativeQtObject. If not, just click on all the ones with a square and see what's inside. There might be another layer of objects to look at inside those.
Sorry I don't have a magic solution :) This is just what I have done in similar circumstances.