Read the instructions for that form to determine whether you must report the gifts. The instructions include this statement:
Joint Returns
If you and your spouse are filing a joint income tax return for tax year 2022, and you are both transferors, grantors, or beneficiaries of the same foreign trust, then you may file a joint Form 3520. If you and your spouse are filing a joint Form 3520, check the box on line 1i on page 1.
https://www.irs.gov/instructions/i3520#en_US_2022_publink1000190314
