TurboTax needs the information for two reasons.
(1) It has to put it on Form 8949. It can't file the form with information missing. The IRS requires the information. You have to include it on your tax return, whether or not the brokerage reports it to the IRS.
(2) It needs the information in order to correctly calculate your gain or loss and to calculate the correct tax.
If you purchased the ETF through the same brokerage, they should have the information. Ask them if they can give it to you. They might omit it from the statement because they are not legally required to report it. (The rules for an ETF for digital assets might be different then for ETFs for stock.)
