[Python] FastAPI - How to get app instance inside a router?

I want to get the app instance in my router file, what should I do ?

My main.py is as follows:

# ...
app = FastAPI()
app.machine_learning_model = joblib.load(some_path)
app.include_router(some_router)
# ...


Now I want to use app.machine_learning_model in some_router's file , what should I do ?

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