Per NJ:
The Division is flexible in reporting CRD distributions. You can report income over three years or in one year (the year of distribution). In either case, you must use State reporting calculations to determine the New Jersey taxable and excludable amounts, since most retirement plans include previously taxed contributions. See pages 12 – 14 of the NJ-1040 instructions or GIT-1&2 .
NJ Division of Taxation - COVID-19 Information - Pensions, IRA, and 401K Distributions
This is only a guess, but the uniqueness of how NJ handles retirement distributions may preclude efiling the state return. I would just bite the bullet and file by mail.
