Nifi:creating json array from json flow file using groovy script

[#1]

Hi , I am new to the groovy... I want to know, how json array can be formed for dynamic variables from json flow file thorough groovy script.. please let me know, if you have an idea 

[#2]

Hello @Manimaran,
to help you it would be good if you go a bit more specific into your question with some sample content and what you want to have as expected output.

Greetings