def label_from_attrs(da: DataArray | None, extra: str = "") -> str:
    """Makes informative labels if variable metadata (attrs) follows
    CF conventions."""
    if da is None:
        return ""

    name: str = "{}"
    if "long_name" in da.attrs:
        name = name.format(da.attrs["long_name"])
    elif "standard_name" in da.attrs:
        name = name.format(da.attrs["standard_name"])
    elif da.name is not None:
        name = name.format(da.name)
    else:
        name = ""

    units = _get_units_from_attrs(da)

    # Treat `name` differently if it's a latex sequence
    if name.startswith("$") and (name.count("$") % 2 == 0):
        return "$\n$".join(
            textwrap.wrap(name + extra + units, 60, break_long_words=False)
        )
    else:
        return "\n".join(textwrap.wrap(name + extra + units, 30))
Makes informative labels if variable metadata (attrs) follows
    CF conventions.
xarray/plot/utils.py