I would like to know the file format that can call external process from Unity (C #) in Android environment.

I am creating an Android app,
I do not know the file format that can be executed independently in the Android environment.

The main function is made in Python, and the UI-related is made in Unity.
I plan to run the Python program independently in the Android environment and call it in Unity.

I asked or asked if I could do it with exe, apk, app, etc.
After all, I couldn't conclude what could actually be used.

If i know this, please professor.