def METHOD_NAME(proto: ArrowProto, styler: "Styler") -> None:
    """Marshall pandas.Styler caption into an Arrow proto.
    Parameters
    ----------
    proto : proto.Arrow
        Output. The protobuf for Streamlit Arrow proto.
    styler : pandas.Styler
        Helps style a DataFrame or Series according to the data with HTML and CSS.
    """
    if styler.caption is not None:
        proto.styler.caption = styler.caption