How to run VRA business report from VRO workflow?

My aim is to create a workflow which will prompt user to select a report from a list.

Then the workflow should run the appropriate VRA custom business report and then mail the output to the requestor.

For this the basic requirement is to run the business report. I am not able to find any plugin or any API (REST?) to invoke the required report.

Any help is very much appreciated.

Thanks

-Siva