Groovy Script advice - passing an array list into the data set variable as an array

I have a groovy script in a custom request that returns a list of file names in an array list. The format of the data is as follows:

["filename1.csv","filename2.csv","filename3.csv","filename4.csv"]

I cannot figure out how to pass this array list into the data set variable so that I can iterate over the list of file names in the next orchestration step. I can get the file list in the above format into an output variable but I cannot do the same for the data set variable name.

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