自定义 custom shopify product 产品详情页

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https://www.envision.io/blogs/ecommerce-pulse/95036801-how-to-create-customizable-products-in-shopify-without-an-app

https://community.shopify.com/c/Shopify-Design/Product-pages-Get-customization-information-for-products/m-p/616525

产生form的html: https://ui-elements-generator.myshopify.com/pages/line-item-property