How to fix ModuleNotFoundError: No module named 'frozenlist'

ModuleNotFoundError: No module named 'frozenlist'
Recommended: Install via pip into your active environment.
python -m pip install frozenlist

Verification

Command
python -c "import frozenlist; print(frozenlist.__version__)"
Expected output
Success! frozenlist version x.y.z (e.g., 2.4.0)