How to create a complex object in a stage file CSV by combining information from different sources i

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Hi experts,

I have the requirement to download some data from a BI report and also UCM files I am using two BI reports, in OIC I have two nested foreach loops I am trying to write a structure like this:

{
   "PARAMETROS":{
      "fecha_inicio":"2020-09-01T00:00:00.000+00:00",
      "fecha_fin":"2020-09-15T00:00:00.000+00:00"
   },
   "EXPENSES":[
      {
         "EXPENSE_REPORT_ID":"300000009962077",
         "EXPENSE_REPORT_DATE":"2020-08-28T00:00:00.000+00:00",
         "Archivos":[
            {
               "FILE_NAME":"135.XML",
               "CONTENT":"PD94bWwgdmVyc2lvbj0iMS4wIiBlbmN"
            }
         ]
      },
      {
         "EXPENSE_REPORT_ID":"300000009962119",
         "EXPENSE_REPORT_DATE":"2020-09-01T00:00:00.000+00:00",
         "Archivos":[
            {
               "FILE_NAME":"155.XML",
               "CONTENT":"PD94bWwgdmVyc2lvbj0iMS4wIiBlxyZ"
            },
            {
               "FILE_NAME":"188.XML",
               "CONTENT":"PG91bWwgdmVyc2lvbj0iMS4wIiBlOJK"