To report the distribution of a 529 to pay for your child's private school tuition at a school outside the US, you should enter the information as though you had received a 1099-Q.
If the amount was less than $10,000 and it was all spent on tuition, just don't enter the 1099-Q in TurboTax.
When the box 1 amount on form 1099-Q is fully covered by expenses, TurboTax will enter nothing about the 1099-Q on the actual tax forms. But, it will prepare a 1099-Q worksheet for your records
On form 1099-Q, instructions to the recipient reads: "Nontaxable distributions from CESAs and QTPs are not required to be reported on your income tax return. You must determine the taxability of any distribution."