Pretty input for bandit_bla endpoint

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{"subtype": "BLA", "historical_info": {"arms_sampled": {"arm2": {"win": 20, "total": 30, "loss": 0}, "arm3": {"win": 0, "total": 0, "loss": 0}, "arm1": {"win": 20, "total": 25, "loss": 0}}}}

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