/usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/okular/qmldir is in qml-module-org-kde-okular 4:17.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | module org.kde.okular
plugin okularplugin
DocumentView 2.0 DocumentView.qml
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