def _extract_bold_text(chars: list) -> str:
    """
    Extract the bold text from a PDF cell.

    Keyword arguments:
    chars -- the list of characters in the cell

    Returns: the bold text
    """
    bold_chars = [char["text"] for char in chars if "Bold" in char["fontname"]]
    bold_text = "".join(bold_chars)
    return bold_text