401k to Roth IRA conversion

Hello! 

 

I asked this question before, but I'm still a bit confused. In 2017, I converted an employer-sponsored 401k to a Roth IRA. I think it was a trustee-to-trustee transfer; when the money was transferred to the company with whom I already had a Roth, they put it in a "rollover IRA brokerage account," then from there I moved it into my Roth IRA. So, do I count that converted amount as an amount that was converted from a traditional IRA? When tracking  my cost basis for my Roth on TurboTax, it has me fill in previous contributions, and previous conversions "from a traditional IRA." It doesn't give me any option to fill in previous conversions from a 401k. So, does my 401k conversion count as a "traditional IRA conversion"? 

 

Thank you!