Can I submit a T777s form through turbotax?

Yes, you can.

To get to the Employment Expenses section in TurboTax Online:

1. Select Find in the upper-right area. (The Find button becomes visible after you have completed the Introduction/Profile section.)
2. In the Find window, type “employment.”
3. Select Employment Expenses from the list of results, then select Go.
4. Answer the questions and if you need to use the T777s, TurboTax will generate this form for you.

If you have TurboTax Live Assist & Review, here is how to talk to a Tax Expert: https://turbotax.community.intuit.ca/community/navigating-turbotax/help/i-m-using-turbotax-live-assist-review-how-do-i-talk-to-a-tax-expert/00/873764