As discussed during the Qt for Python documentation session during the Qt Contributors Summit 2019, and since it was pointed out on an email discussion, it would be a good idea to include an annotation that indicates when parameters delegate their ownership to the caller.

An example of a function that doesn't document this detail
https://doc.qt.io/qt-5/qboxlayout.html#addLayout

An example of a function that does document this detail:
https://doc.qt.io/qt-5/qlayout.html#addItem

I guess te same message could be the same from the last one:
Note: The ownership of ____ is transferred to the layout, and it's the layout's responsibility to delete it.

During the email discussion, an alternative tag (like \a) was suggested: \o (or even \ao)

This will help the current process of ownership transfers in the Qt for Python project, from which is currently done by hand, on the XML typesystem