Shopify’s dawn theme will cause a warning in Google Search Console.

Missing field "priceValidUntil" (in "offers")

While this warning does not affect ranking, it may affect appearance.

"priceValidUntil": "{{ 'now' | date: '%s' | plus: 86400 | date: '%Y-%m-%d' }}"

Place this snippet in main-product.liquid at the end of the ld+json segment.