Is there a way to add a prefix to all elements in array in jolt?

I would like to add a constant prefix eg."0" to all the fields in an array.

This is the input:

{
  "input": [
    "1_ANY",
    "2_ANY",
    "3_ANY"
  ]
}

Output:

{
  "output" : [ "1", "2", "3" ]
}

Expected Output:

{
  "output" : [ "01", "02", "03" ]
}

I have tried with below jolt transformation Spec :

[
  {
    "operation": "shift",
    "spec": {
      "input": {
        "*": {
          "*_*": {
            "$(0,1)": "output"
          }
        }
      }
    }
  }

]

Is there a way I can add a constant prefix to all elements in the array of strings ?

You can add modify-overwrite-beta spec to the one you created to do the concatenation as follows:

[
  {
    "operation": "shift",
    "spec": {
      "input": {
        "*": {
          "*_*": {
            "$(0,1)": "output"
          }
        }
      }
    }
  },
  {
    "operation": "modify-overwrite-beta",
    "spec": {
      "output": {
        "*": "=concat('0',@0)"
      }
    }
  }

]

Or you can do it using two shift operations as follows:

[
  {
    "operation": "shift",
    "spec": {
      "input": {
        "*": {
          "*_*": {
            "$": "0&(1,1)"
          }
        }
      }
    }
  },
  {
    "operation": "shift",
    "spec": {
      "*": {
        "$": "output"
      }
    }
  }

]