Excessive Roth IRA contribution correction without 1099-R

Hello, I would like to report the income attributed to the excess contribution to my husband's Roth IRA in 2020. He made a contribution before we got married and we later found out our income was too high to qualify. He filed the paperwork to remove the excess contribution plus gains/earnings, and Fidelity completed this step. We will get a 1099-R next year that will report this, however, my understanding is the earnings are subject to tax this year. We know the taxable amount. I'm worried if we don't report the earnings now, we will have to file an amended return for 2020 next January after we receive the 1099-R. Any advice would be greatly appreciated!