This sample is to display the value label outside the bar.

sets the labelPosition property to "outside".
labelPosition
inside: sets the location of the label inside the bar
outside: sets the location of the label outside the bar
both: sets the location of the label inside and outside the bar

●Layout
<Column3DSeries yField="Profit" displayName="Profit" formatter="{numFmt}" 
labelPosition="outside" styleName="seriesStyle">