This page in the documentation http://qt-project.org/doc/qt-5/qtqml-syntax-objectattributes.html explains how to instantiate group properties (e.g. anchors{…}). It is silently about how to create your own grouped property, though.
This QtBug page https://bugreports.qt-project.org/browse/QTBUG-15269 has been closed and states that apparently it is now possible to create your own grouped property. The question is: how???
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