Question for Qt6.2 - Qt.labs.platform Dialog

[mingr]

In Qt 5.15, Qt.labs.platform Dialog seems to be fine, and I can use it just by declaring it.

But seems like for Qt6, the Dialog can no longer be used. As it will now show Dialog is an abstract base class.

I wonder if this is the case or I set up things wrong?

I did not see any doc mentioning the change.

Platform: Windows/msvc_2019_64