Did you ever make progress on this, I have a similar issue on the forum...
<configuration label="Charts (example)"> <highlightcolor>0x336699</highlightcolor> <layers> <layer label="Pipe Size" url="http://gis01.wch-rcc.com/ArcGIS/rest/services/rkz/chart/MapServer/0"> <labelfield>MATERIAL</labelfield> <fields> <field name="MATERIAL"/> <field name="Shape_Length"/> </fields> <medias> <media chartfields="Shape_Length" title="Pipe Type" type="piechart"/> </medias> </layer> </layers> </configuration>
<?xml version="1.0" ?> <configuration> <highlightcolor>0</highlightcolor> <labels> <layerselectionlabel>Select layer</layerselectionlabel> <drawtoolmenulabel>Select draw tool</drawtoolmenulabel> </labels> <layers> <layer label="Erosion Hazards test" url="http://olga.er.usgs.gov/stpgis/rest/services/Vulnerability/ALL_erosion_hazards_test/MapServer/0"> <labelfield>CCOL1_1</labelfield> <fields> <field name="CCOL1_1"/> <field name="SHAPE.LEN"/> </fields> <medias> <media chartfields="SHAPE.LEN" title="COL1 Example" type="piechart"/> </medias> </layer> </layers> </configuration>