I second the request for basic support for the form. I don't think the poster is asking (and I'm certainly not) for TurboTax to do the calculations for me. I would like some tax software to allow me to input the results of my calculations on Form 8621 and then manually include the resulting income in other forms (Schedule D in the case of pro rata share of net capital gains).
It is incredibly frustrating that in my case — an American abroad who has simple index ETF investments, long term buy and hold only, in my country of residence (Canada) and has to file US taxes by virtue of my citizenship but never owes anything to the US due to foreign tax credit and/or exclusion — I have to file on paper because of this form, and this form only. The IRS still hasn't processed my 2021 taxes, filed on paper in June 2022!
(I wound up in this thread trying to figure out precisely which line to post QEF gains on in Schedule D.)
