Split a flow file to multiples, related by common key and with split count

[James McMahon]

I have a series of attributes that result from an EvaluateJSonPath. One of
those attributes, FNAME, appears to be a list of values like so:
[“A”,”B”,”C”]. I want to split my flow file into one for each list element.
I need my results to have the original content, all the original
attributes, and its value for the split result out of the list as a new
attribute. I need to also know the split count, and be able to later merge
my flow files after evaluating the results of the split.
How can I accomplish this?
Thanks very much in advance.