Import custom QML item from external library (cmake)

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I created a library with some QML items.
From application main.cpp file which uses that library I can load those items by:

qmlRegisterType<MyClassCpp>("MyClass", 1, 0, "MyItem1");

Then they can be used in QML files through import statement

But how to avoid loading all those items from main.cpp, and just import them in QML.
I read:
http://doc.qt.io/qt-5/qtqml-tutorials-extending-qml-example.html
and
http://doc.qt.io/qt-5/qtqml-modules-cppplugins.html
But I dont know how to do this with cmake.

Please help