unjson nested columns

un_json.py

def un_json(input_dict: dict[str, str | float]):
    processed_dict = {}
    for key, value in input_dict.items():
        if isinstance(value, str) and value.startswith(('{', '[')):
            try:
                processed_dict[key] = json.loads(value)
            except json.JSONDecodeError:
                processed_dict[key] = value
        else:
            processed_dict[key] = value
    return processed_dict