How to Change chart dimensin and percentage font size

 In Peoplesoft using Oracle XML Publisher, I am generating a Pie-Chart which plots a graph with 5 different sections each holding a percentage value.

Chart will by defaults generates the text and numeric values with a specific size and font.

Can some one please tell me how to increase the font size of the percentage values as well as the section area labels.

Below is the code of my XMLP Chart:

chart:
<Graph graphType="PIE">
<SeriesItems>
<Series id="0" color="#FF0000"/>
<Series id="2" color="#0000FF"/>
</SeriesItems>
<Title text="Test" visible="true" horizontalAlignment="CENTER">
<GraphFont name="Arial" size="50"/>
</Title>
<LocalGridData rowCount="{count(.//row_KC_STG_KREEUTIL)}" colCount="1">