In my brokerage tax statement, a part "supplemental information not reported to the IRS" with -21.11 in "proceeds investment expenses" for Gold ETF. Where enter in turbo?

Under the new tax law Investment Expenses/Fees are no longer deductible.

Before 2018 you could only deduct a portion of them if you Itemized your Deductions and your investment expenses exceed 2% of your AGI.