How to use pyinstaller with this template?

[hellodword]

git clone --depth=1 https://github.com/rochacbruno/fastapi-project-template
cd fastapi-project-template

# setup venv ...
python -V
# Python 3.11.4

pip install -r requirements.txt
python -m project_name run
# all ok

Try pyinstaller:

pip install pyinstaller
pyinstaller --name project_name -y --onefile project_name/__main__.py
./dist/project_name

Got:

Traceback (most recent call last):
  File "project_name/__main__.py", line 2, in <module>
    from .cli import cli
ImportError: attempted relative import with no known parent package
[455] Failed to execute script '__main__' due to unhandled exception!

It seems that this error can be solved with from project_name.cli import cli, but this is not a graceful solution I guess.