you can make a converter like this in javascript

var ArabicNumbers = ["٠", "١", "٢", "٣", "٤", "٥", "٦", "٧", "٨", "٩"]

function arabify(num) {
  num = num + ""
  let newNum = ""

  for (var i = 0; i < num.length; i++) {
    newNum += ArabicNumbers[num[i]]
  }
  return newNum
}

console.log(arabify(94569))
console.log(arabify(100))
console.log(arabify(256))

when you have a number that has to be shown in Arabic numbers, you can just run this function for your number in javascript.
I don't have experience with netsuite, so I can't help you about this(
but you tagged js too, so I thought you may want to see a way to convert it in frontend.

I shorter one-line method to convert numbers to Arabic and keeping all text unchanged is as follows:

const numToAr=n=>(""+n).replace(/\d/g,d=>"٠١٢٣٤٥٦٧٨٩"[d]);

Here are a few examples:

const numToAr=n=>(""+n).replace(/\d/g,d=>"٠١٢٣٤٥٦٧٨٩"[d]);

console.log(numToAr(94569))
console.log(numToAr(100))
console.log(numToAr(256))
console.log(numToAr("العدد هو 543"))