Edit fiddle - JSFiddle - React, Tailwind, and code Playground

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JavaScript

//Assuming res.INSTANCE_PO is javascript arrray

var res={}
res.INSTANCE_PO=[{external:500,internal:500}]

 res.INSTANCE_PO[0]['internal'] = 600
 
 console.log(res.INSTANCE_PO)
 
 //Assuming res.INSTANCE_PO is json string
 
 var res={}
res.INSTANCE_PO='[{external:500,internal:500}]'

 res.INSTANCE_PO[0]['internal'] = 600
 
 console.log(res.INSTANCE_PO)

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