What are you using to create your Pie Chart? Talend is an integration tool. You need a graphical tool like Excel, Tableau etc to generate your graph.
You can use Talend to process your CSV file to clean up your data before you load the data into a reporting tool.
This is definitely not a Talend Tasks, but it could be resolved as suggested by @TRF, or I prefer use Talend with JasperReport Server this more flexible way, not depends from libraries and could run any type of reports
You can run tJasperServerExec component for this or use REST interface for do all by Your self