How to add label to lable1/2 in chartdesigner 640 ?

Hello

I'm using chartdesigner 640 and I have 20 categories and dynamic number of series

I want to put dynamically label at each series per categories                                                    

I've seen in the designer  that the label is placed in each series as label 1/1  label 1/2 etc..

How in sap program can I change the label?

Is it in the transformation of data that looks?

<?sap.transform simple?>
<tt:transform xmlns:tt="http://www.sap.com/transformation-templates">
  <tt:root name="CATEGORIES"/>
  <tt:root name="SERIES"/>
  <tt:template>
    <ChartData>
      <Categories>
        <tt:loop ref="CATEGORIES">
          <Category>
            <tt:value/>
          </Category>
        </tt:loop>
      </Categories>
      <tt:loop ref="SERIES">
        <Series>
          <tt:attribute name="label">
            <tt:value ref="LABEL"/>
          </tt:attribute>
          <tt:attribute name="customizing">
            <tt:value ref="ID"/>
          </tt:attribute>
          <tt:loop ref="VALUES">
            <Point>
              <Value type="y">
                <tt:value/>
              </Value>
            </Point>
          </tt:loop>
        </Series>
      </tt:loop>
    </ChartData>
  </tt:template>
</tt:transform>

Or I  neet  to change the customizing

lf_element = gv_ixml_custom_doc->find_from_id( name = 'id' value = lv_series  ).

Can anyone give me  example how to write it

Thank you Shlomit