You will need to amend the 2020 and 2021 tax returns that were filed to add the W-2 for each tax year.
TurboTax does not support tax year 2020 so you will need to access a local tax professional to assist you in amending the 2020 tax return to add the 2020 W-2.
For tax year 2021 -
See this TurboTax support FAQ for amending a prior year tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
