def METHOD_NAME():
    description = """Assemble fields in a fields container."""
    spec = Specification(
        description=description,
        map_input_pin_spec={
            0: PinSpecification(
                name="field",
                type_names=["field"],
                optional=False,
                document="""""",
            ),
            1: PinSpecification(
                name="label",
                type_names=["label_space"],
                optional=True,
                document="""Label space value that must be applied to the
    added field.""",
            ),
        },
        map_output_pin_spec={
            0: PinSpecification(
                name="output",
                type_names=["fields_container"],
                optional=False,
                document="""""",
            ),
        },
    )
    return spec