You are correct that TurboTax does not support PFIC taxations or the reporting form, Form 8621 due to their very complex nature.
You are only responsible for reporting on PFICs that you have owned since the date you became a U.S. person for tax purposes. In your case, this sounds like it would be 2017.
Most of the information that you are seeking can be found in the Form 8621 instructions here: Form 8621 Instructions. However, the instructions aren't particularly user friendly.
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