|myProject
   |-- qml  
      |-- QtQuick  
         |-- Pdf  
             qmldir  
             plugins.qmltypes  
             pdfplugin.dll  
             [...] 
   main.cpp
   main.qml
   someComponent.qml
   [...]

I’m building with CMake and added the import path like it is described here:

set(QML_IMPORT_PATH ${CMAKE_SOURCE_DIR}/qml ${CMAKE_BINARY_DIR}/imports CACHE STRING "" FORCE)

And I imported the module in my qml files using

import QtQuick.Pdf 5.15

Sadly I get a “QML module not found” exception. Obviously I’m missing something important and would be grateful if someone could point me to it.
If something is unclear or you need more information or code snippets from any files, I'm happy to provide the information needed.