how to split in multiple file class models.py?

Hello everyone, I have a question about Django and the use of namespaces or packages to split the models.py file.
I would like to adopt the Java philosophy in which one file corresponds one class and one db table.
I tried to follow this guide, but it doesn't work.
https://docs.djangoproject.com/en/3.1/ref/applications/#namespace-packages-as-apps

when I execute this command: "python manage.py makemigrations myapp"

Return this warning: "No changes detected in app"

Is it possible to do this structure?

/models
    __init__py # if i use package, or without for namespace
         #common import
    car.py # class car
    group.py # class group
    manufactor.py # class manufactor
    /otherPackage
        __init__py
            common import
        otherClass.py

I hope you understand what I'd like to do.
Thank you.

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