XML TO JSON conversion in SAP

I have below incoming XML and I need to convert it to JSON format. My application support only XSLT 2.0. could you please suggest me how to achieve this.

Input XML:

     <?xml version="1.0" encoding="utf-8"?>
        <n0:Bill_out xmlns:n0="http://bill.com/PI/YYY"> "namespace
              xmlns:prx="urn:sap.com:proxy:AAA:/1SAI/123489">

   <row>
  <user_name>1.00</user_name>
  <code>P120</code>
  </row>
  <row>
  <user_name>2.00</user_name>
  <code>x120</code>
  </row>
 </n0:Bill_out>

Output Json:

    [
   {
    "user_name": "JAN_123",
    "code": "120"
    },
   {
 "user_name": "JAN_345",
  "code": "129"
 }
 ]