Running app_cli says jsonmaestro is not a package

Trying to run app_cli.py,,,

PS C:\Users\gbown\Documents\json-maestro\src\jsonmaestro> python3 app_cli.py     
Traceback (most recent call last):
  File "C:\Users\gbown\Documents\json-maestro\src\jsonmaestro\app_cli.py", line 2, in <module>
    from jsonmaestro.jsonmaestro import add_schema_keys, sort_json_keys, 
ModuleNotFoundError: No module named 'jsonmaestro.jsonmaestro'; 'jsonmaestro' is not a package

it does exist here:

https://pypi.org/project/jsonmaestro/

Note: this is the same behavior in pip 25 and python3 3.13