I figured it out. There is a custom attributes field, using the storefront APIhttps://shopify.dev/docs/storefront-api/reference/mutation/input-object/checkoutlineiteminput

Hello,my client sells bags with 10 options and each option has 5-20 colors. So I cannot use products or variants to handle that.Since it is a small store, we will not pay for shopify plus. I would like to call the checkout page with a string of optio...