Yes, you can amend your 2018 to show the carryover, and you may get a refund because of it, if you file by April 18, 2022.
You will have to see if the amount carries forward beyond 2018 or not, by preparing that amendment.
Once you have made those changes check your return to see if you have a carryover to 2019. If not, you don't need to amend any more returns.
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