Hi there - just wanted to update this post, as SparkLayer have now released functionality to specify custom attributes to specific line items in the cart. You’ll need a developer to write some code that works with their JavaScript SDK. We have clients at our agency that we will be developing an integration for, so if you need any help with that, let us know!
You can view their docs here:
https://docs.sparklayer.io/tech-docs/javascript-sdk#hyAeM
For merchants eager to offer customizations for their products, such as custom text or any other unique requirements, SparkLayer introduces a flexible solution via a pre-cart-update hook. Once an item adorned with custom attributes is placed in the cart, these customizations become visible under the product SKU. This visibility extends to past orders, ensuring that custom attributes are consistently accessible.
This functionality facilitates the incorporation of custom code, allowing for seamless customization management directly from your eCommerce storefront.
If this now answers the question, please can you update the accepted answer to this post (rather than the other one above).