String interpolation and static strings with shift operation

[timothyj-splunk]

Great work here!
Is there a way to build strings (ala go fmt.Sprintf or other interpolation) in the shift operation? Something simpler that concat.

I'm looking for a mix of "value" fields (that preserve the selected values' type) and "interpolated string fields" (that are always strings and may be simple static strings).

Like this perhaps:

Transform (note the '):

{
  "outputField": [ "'some-prefix-", "input.value" ]
}

Input:

{
  "input": { "value": 47 }
}

Output:

{
  "outputField": "some-prefix-47"
}