I need help in generating xml reports from qlikview with the fields specified
You can use VB Macro APIs to do server side export of charts/tables in XML format. Look into APIGuide for Graph Object and Export Member.
For an example you can take a look at the way XML is generated in the sample app at the link below:
Here the XML is being sent to an ASP page to be processed much like a web service would. But its the same principle.