Not sure if I understand your question correctly. This library provides bindings to Qt gui and Qt widgets C++ classes (and some helper functions to work more easily with them). These widgets provide the elements you see on the screen (e.g. a push button, or a window, or a text edit etc). You can then layout these widgets in nim source code, and compile it.
If you mean with "component"-libraries libraries that provide custom widgets, then you could make your own widgets with it (in nim code) and share them as a nim library.
