Another Trick:
For lines, you can add labels and select which values will be displayed:

 
Together with the label, there will be the line:

one option to hide it:
adjust the color of the label (e.g. black) and use white for the line:

 
Names Default to Here(1);
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
Graph Builder(
	Variables( X( :sex ), X( :name, Position( 1 ) ), Y( :height ) ),
	Elements(
		Line( X( 1 ), X( 2 ), Y, Legend( 1 ), Interval Style( "Arrow" ) ),
		Bar( X( 1 ), X( 2 ), Y )
	),
	SendToReport(
		Dispatch( {}, "400", ScaleBox,
			{Legend Model(
				1,
				Properties(
					0,
					{Line Color( 2 ),
					Line Label Properties(
						{Max Value Label( 1 ), Label Color( "Black" ), Width( 9 )}
					)}
				)
			)}
		)
	)
);