Yes, you are correct that you would need to file for an individual taxpayer identification number (ITN) by filing Form W-7, and file a 1040-NR to get a refund of the taxes withheld.
Whether you would get all of the withholding refunded depends on the total amount of US income.
TurboTax doesn't handle Form 1040-NR, but you can use Sprintax. Follow this link for more about that.
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