As of 2023-04-27, getting PyQt5 installed in Python seems much harder for Python versions 3.10 and later. I ended up using Python 3.9 for this reason for Foliage development.
On macOS Ventura, When I tried pip install pyqt5, it produced errors that implied it couldn't find qmake.
I got a copy of qmake by doing
brew install qt5
This put qmake in /opt/homebrew/opt/qt5/bin. I put that path on my shell $PATH, and verified qmake existed, then ran
pip3 install pyqt5 --config-settings --confirm-license= --verbose
again, and it worked that time.