How to use the autoprotocol.instruction.LiquidHandle.builders.position_z function in autoprotocol

Generates a position_z to followup after the specified one. If the
        liquid surface is referenced, then returns a position that similarly
        tracks the surface. Otherwise, generates a reference to the preceding
        position.

        Parameters
        ----------
        position_z : dict
            position to be referenced when deciding on a followup position

        Returns
        -------
        dict
            position_z to follow up at a non-sensing position
        """
        preceding_z = LiquidHandle.builders.position_z(reference="preceding_position")
        if not position_z:
            followup_z = preceding_z
        elif position_z["reference"] == "liquid_surface":
            followup_z = LiquidHandle.builders.position_z(
                reference="liquid_surface",
                offset=position_z.get("offset"),
                detection_method="tracked",
            )
        else:
            followup_z = preceding_z

        return followup_z

"""Dispenses the target volume into the destination location

        Parameters
        ----------
        volume : Unit
        density : Unit

        See Also
        --------
        dispense_z : holds any user defined dispense_z parameters
        default_dispense_z : specifies default dispense_z parameters
        _dispense_simple : lower level helper that generates dispense transports
        """
        dispense_z = self.dispense_z or self.default_dispense_z(volume)

        dispense_z = LiquidHandle.builders.position_z(**dispense_z)
        self._dispense_simple(
            volume=volume,
            calibrated_vol=self._source_liquid._get_calibrated_volume(
                volume, self.tip_type
            ),
            initial_z=dispense_z,
            flowrate=self._source_liquid._get_dispense_flowrate(volume, self.tip_type),
            delay_time=self._source_liquid.delay_time,
            liquid_class=self._source_liquid.name,
            density=density,
        )

def _move_to_well_top_before_lld(self, position_z):
        """If position_z contains any liquid sensing moves to well top

        Parameters
        ----------
        position_z : dict
            position_z to be checked for lld events
        """
        well_top_z = LiquidHandle.builders.transport(
            mode_params=LiquidHandle.builders.mode_params(
                position_z=LiquidHandle.builders.position_z(reference="well_top")
            )
        )

        if position_z:
            if position_z.get("reference") == "liquid_surface":
                if position_z.get("detection", {}).get("method") != "tracked":
                    self._transports.append(well_top_z)