Object
6988:Array[2]
0:Object
code:"100003 - ONLY_EAN_ALLOWED"
title:"The EAN (GTIN) must be specified as a numeric value with 8 or 13 digits and must be within a globally unique value range according to the GS1 standard, so it must not, for example, start with 2."
path:"/products"
jsonPath:"$.productVariations[?(@.sku==\"6988\")].ean"

If the EAN criteria are met (8 or 13 digits, within the unique value range), check whether the EAN is valid.
You can check its validity, for example, here:
Verified by GS1 | Barcode GTIN GLN Company Lookup Verification