Modules you probably need:
sudo apt-get install qt5-default qml-module-qtquick-controls qml-module-qtquick-controls2
Also recommended:
sudo apt-get install qml-module-qtlocation qml-module-qtpositioning
I think also
sudo apt-get install qml-module-qtquick-templates2
At present, https://packages.debian.org/buster/libs/qml-module-qtcharts indicates we can't easily insdtall qtcharts yet
For pyqt, regular pip install won't do. Use:
sudo apt-get install pyqt5-dev pyqt5-dev-tools python3-pyqt5.qtquick
Also recommended
sudo apt-get install python3-pyqt5.qtpositioning
Be sure to use raspi-config and set Advanced Options|GL Driver|G1 GL (Full KMS)
Do pip3 install pyqt5
Also experimenting with pip3 install PyQtChart