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In Python, you can use the arrow "->" return type hints to specify the return type of a function. If a function returns two lists, you can specify the return types of the two lists using the following syntax:

def my_function() -> Tuple[List, List]:
    # function code...
    return list1, list2

In this example, we use the Tuple class to specify that our function returns two lists, and we specify the type of each list as List. This tells other developers (and tools like linters) that the function is expected to return two lists of data.

By using return type hints, you can make your code more clear and explicit, which can be helpful for documentation and maintenance purposes.