How to base64 decode value of dynamic json array in NiFi?

I want to base64 decode encoding string of json array property not using hard code!!

This array size is dynamic.

Is there the way of decoding value using JoltTransformJson in NiFi?

Input JSON

{
  "A": [
       {
         "CC" : "Encoded string",
         "DD" : "any string"
       },
       {
         "CC" : "Encoded string",
         "DD" : "any string"
       }
     ]
  "B": "any string"
}

Output JSON

{
  "A": [
       {
         "CC" : "Decoded string",
         "DD" : "any string"
       },
       {
         "CC" : "Decoded string",
         "DD" : "any string"
       }
     ]
  "B": "any string"
}