Are you saying that these "employee contributions" were not reported on your 2019 W-2 in box 12 with a code of W?
No, you would not add them to your 2020 return, but if your employer actually forgot to include them on your 2019 W-2, then you would get the 2019 TurboTax software (unless you already have it), start the amendment process, then go to the HSA interview, then on the screen, "Did your employer tell you about any other contributions?" you would say Yes and enter employer contributions not reported on your W-2.
But check with your employer first, to make sure that they weren't already reported on your 2019 W-2.
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