Passing Dataset from Data Request to Groovy

I am able to pull JSON dataset out of Data Request but I want to pass that data to the next step (Custom function) Groovy, may someone please help to provide a simple groovy code just to print (echo) the data of the previous step once I get the data in Groovy step I will figure out how to manipulate that data. by the way I am using E1 9.2.5
Thanks,