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A function cannot be directly sent as a payload in the Firebase tasks queue, as the payload must be a JSON serializable object. However, you can define your function as a callable object (such as a class with a __call__ method), serialize it as a string (using pickle or similar libraries) and then include the serialized function as part of the payload.

When processing the task, you can then deserialize the string back into a callable object and execute it. Keep in mind that there may be security implications to executing untrusted code, so careful consideration should be given to the design and implementation of this approach.