Thanks for your suggestions.
@Akash: We are not looking for full reporting tools, we are just looking for xml generated output from LN, which will serve as an input for our external document design tool.
@michael: I know those functions, but if I use those I will have to create full documents from scratch for each of the external documents, which is a lot of work. I was/am hoping on a dynamic solution which can serve for any LN report to get the output in useful XML format.
If any external (3rd party) plug-in or add-on is available that could also be very helpful.