I built QT 6.2.2. for MacOS first and then configured QT 6.2.2 for iOS as follows:
./configure -c++std c++20 -opensource -confirm-license -no-openssl -securetransport -DQT_NO_EXCEPTIONS=1 \
-platform macx-ios-clang -release -qt-host-path /usr/local/Qt-6.2.2 -prefix /usr/local/Qt-6.2.2-ios \
-skip qt3d -skip qt5compat -skip qtactiveqt -skip qtcharts -skip qtcoap -skip qtconnectivity \
-skip qtdatavis3d -skip qtdoc -skip qtlottie -skip qtmqtt -skip qtnetworkauth -skip qtopcua \
-skip qtserialport -skip qtpositioning -skip qtquicktimeline -skip qtquick3d -skip qtremoteobjects \
-skip qtscxml -skip qtsensors -skip qtserialbus -skip qtvirtualkeyboard -skip qtwayland \
-skip qtwebchannel -skip qtwebengine -skip qtwebview