The easier thing to do would be to contact your employer and ask them to issue you a corrected W2 that includes the bonus as they should have withheld FICA taxes from the bonus.
In the meantime, if they won't change it, you can enter it as the 1099-NEC which will cause you to pay self-employment taxes so you will pay double the social security and Medicare taxes you should pay on it or you can enter it as other income. If you enter as other income, you will under pay your share of social security and Medicare.
Edited 4/4/2022 @ 4AM PST @TCPITTS
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