Do I have to report adjusted qualified dividends for ETFs that I sold after holding the shares for less than 61 days?

Yes, if you held the ETF shares for less than 61 days, you can't treat the dividends as qualified. Instead, they would be taxed as ordinary income at your regular tax rates

For more details, you can refer to this TurboTax article. Click on the link and scroll to the section on What are qualified and unqualified dividends,