Add Commas to Numeric Response

I'm asking survey respondents how much they spend on certain products - the challenge I'm facing is that any person's spend could be a few thousand or multiple millions. In order to help the respondent not make a mistake, I want to make my Numeric field add commas when respondents enter a figure with more than 3 digits. This will help them catch a mistake of 60,000,000 v. 6,000,000 v. 600,000.

Does anyone know how to add this functionality to a numeric response?

Thanks!

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