how to add a column and merge the data

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I am new to talend and working on gaining the knowledge. I need assistance.

I am reading json data and putting into tLogRow output. Now I have to append a column to the final output and need to write back into json.

I am stuck at how to add a column to the existing data set.

{
    "CustID": 1,
    "CustName": "surk",
    "Region": "a",
    "TrxAmount": 917
},

Column to be added : Date_Generated it can be sysdate.

and final output can be CustId,CustName,Region,TrxAmount,Date_Generated

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