Yes, you can file jointly with your spouse by claiming him as a resident.
You would need to make an election to claim him as a resident. TurboTax does not provide any tools or forms to assist you to make the election, unfortunately. You would need to follow IRS's instructions to attach the statement to your 2020 tax return. You cannot e-file. Instead, print out all your tax forms along with the statement and paper-file. To see instructions, click here to see Nonresident to resident
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