Yes, you are required to report all contributions to your HSA, from any source.
These contributions should be reported as "personal" contributions in the HSA interview in TurboTax on the screen headed "Let's enter [name]'s HSA contributions (see screenshot). The total personal contributions will appear on line 12 of Schedule 1 (Form 1040) and will also appear on line 2 of form 8889.
[Edited 4/1/2020 1:35 pm CDT - updated for 2019]