The Kiddie tax is only for unearned income, interest, dividends and capital gains. The income you posted cannot be used for the Kiddie tax.
Then child's earned income from work reported on a W-2 or the earned income from Self-Employment reported on the 1099-NEC is not entered on your tax return. They must file their own tax returns to report the income received. Any taxable scholarships are entered on their tax returns.
