how to read array of values in REST request

requestClassCode array in the below request may or may not contain more than 1 value. What is the best way to maintain that in my data sheet and read it properly into the json request.

Below is the json Request:

{
"id1": "${ReadExcel#id1}",
"id2": "${ReadExcel#id2}",
"id3": "${ReadExcel#id3}",
"id4": "${ReadExcel#id4}",
"requestReceivedDateRange": {
"date1": "${ReadExcel#date1}",
"date2": "${ReadExcel#date2}"
},
"filterCriteria": {
"date3": "${ReadExcel#date3}",
"requestClassCode": ["",""]
}
}