Here is an example code, the horizontal / vertical alignment causes the build error.

Code:  

import QtQuick

Rectangle {
    Component {
        id: textComp
        Text {
            width: 128
            height: 64
            font.pixelSize: 16
            text: "Build Error"
            horizontalAlignment: Text.AlignHCenter
            verticalAlignment: Text.AlignVCenter
        }
    }
    Loader {
        sourceComponent: textComp
        active: true
    }
} 

Error message: 

C:/work/QTMCU341/build/Qt_for_MCUs_2_8_Desktop_32bpp_MINGW-Debug/CMakeFiles/QTMCU341.dir/QTMCU341.cpp: In constructor 'QTMCU341::text_2::text_2(QTMCU341*)':
C:/work/QTMCU341/build/Qt_for_MCUs_2_8_Desktop_32bpp_MINGW-Debug/CMakeFiles/QTMCU341.dir/QTMCU341.cpp:71:5: error: 'horizontalAlignment' was not declared in this scope
   71 |     horizontalAlignment.setValue(Qul::Private::Items::Text::AlignHCenter);
      |     ^~~~~~~~~~~~~~~~~~~
C:/work/QTMCU341/build/Qt_for_MCUs_2_8_Desktop_32bpp_MINGW-Debug/CMakeFiles/QTMCU341.dir/QTMCU341.cpp:74:5: error: 'verticalAlignment' was not declared in this scope
   74 |     verticalAlignment.setValue(Qul::Private::Items::Text::AlignVCenter);
      |     ^~~~~~~~~~~~~~~~~