Charts in UCI does not work when #PERCENT, #VAL and #TOTAL are used in Chart XML.
Currently we only partially support the #PERCENT in UCI, but not the rest "#VAL of #TOTAL". And we have no plan to support the "#VAL of #TOTAL" in the future. This is the limitation due to switching to Highcharts library. (Webclient is using .NET library and UCI is using Highcharts library)
How to use #PERCENT in UCI
Add "#PERCENT" in <Series> node (and add isValueShownAsLabel="False")
<Series IsValueShownAsLabel="False" LabelForeColor="59, 59, 59" Label="#PERCENT" ChartType="pie">
<SmartLabelStyle Enabled="True" />