Is it correct that I do not need to include the value of inherited traditional IRAs on line 6 of Form 8606?

I have Form 8606 because I made a non-deductible contribution to a traditional IRA and then rolled it into my Roth IRA (backdoor contribution). This was for 2018, all done in March 2019.

Now amending the return to pay tax on the gain on the excess 2018 Roth IRA contribution that I withdrew in March 2019.