1.First, determine if you have anything to report based on the instructions. If you do have income on your federal that should be subtracted, it should carry over. If not, you can enter the information under Other Subtractions.
CT nonresident: Line 44: Refunds of State and Local Income Taxes Enter the amount of taxable refunds of state and local income taxes reported on federal Form 1040, Schedule 1, Line 1, or federal Form 1040-SR, Schedule 1, Line 1. If federal Form 1040, Schedule 1, Line 1, or federal Form 1040-SR, Schedule 1, Line 1 is blank, enter “0.”
2. No, you can't file single since you are married. The instructions say:
Generally, your filing status on your Connecticut return must match your federal income tax filing status...
Special Rules for Married Individuals
When one spouse is a Connecticut resident or a nonresident and the other spouse is a part‑year resident, each spouse who is required to file a Connecticut income tax return must file as married filing separately.
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