/usr/include/KF5/KrossUi/ is in kross-dev 5.28.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/KrossUi/Kross/
/usr/include/KF5/KrossUi/Kross/Ui/
/usr/include/KF5/KrossUi/Kross/Ui/ActionCollectionModel
/usr/include/KF5/KrossUi/Kross/Ui/ActionCollectionView
/usr/include/KF5/KrossUi/Kross/Ui/ScriptingPlugin
/usr/include/KF5/KrossUi/kross/
/usr/include/KF5/KrossUi/kross/ui/
/usr/include/KF5/KrossUi/kross/ui/actioncollectionmodel.h
/usr/include/KF5/KrossUi/kross/ui/actioncollectionview.h
/usr/include/KF5/KrossUi/kross/ui/krossui_export.h
/usr/include/KF5/KrossUi/kross/ui/model.h
/usr/include/KF5/KrossUi/kross/ui/plugin.h
/usr/include/KF5/KrossUi/kross/ui/scriptingplugin.h
/usr/include/KF5/KrossUi/kross/ui/view.h