It is reported in box 17 with a code of X. The UBIA is, in essence, the original basis of any item used in business before depreciation, special depreciation, or Section 179 deductions have been taken on the item owned by the business. And as you comment, this amount can be used to help determine the QBI deduction, especially if the anticipated income is going to be above the Section 199A phase-out threshold for a non-SSTB business.
The QBI calculation is very intricate, but you will want to make sure the correct UBIA is reported in Box 17 with a code of X so that it can be passed through to shareholders and assist them to get the full amount of QBI deduction they are entitled to.
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