Arkansas does have a number of credits and adjustments, but they don' appear to have one for Claim of Right, nor do they have an "other" category. I don't see any way to take a credit or a deduction on your 2019 Arkansas return. I don't believe filing an amended return for 2018 will work, as you would not also be amending your federal return, and your federal AGI is used to determine your Arkansas taxable income.
I suggest you contact the Arkansas Department of Finance at (501) 682-1100 and consult with them.
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