TurboTax is asking for a W-2, but I have a 1099-NEC from one of my employers. How do I submit the 1099?

You can skip the W-2 section if you do not have one.   The 1099-nec is entered as self-employment income.   

How do I report income from self-employment?

I need to enter a 1099 - Am I Self-Employed?