Hi Suwandi!
There is no need to re-invent the wheel.
Take a look at SAP Note: 2175218 - New Feature: Enhanced XML/JSON conversion capabilities
and also at wonderful blog written by Vadim Klimov :
https://blogs.sap.com/2016/01/13/rest-adapter-in-sap-pipo-enhanced-xmljson-conversion/
Regards, Evgeniy.
I found out this Adapter Module which probably could be used to force square bracket:
https://blogs.sap.com/2015/03/18/jsontransformbean-part-2-converting-xml-to-json-content/
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