I have to admit that GraphQL is a mystery to me. I've spent hours trying to figure this out.
Let's say I have order Id: 2812959195213, product id: 4918373154893 and variant id: 33307973320781. I need to add or update the line item properties for that specific product variant in that specific order. I believe I need to use a mutation. Can someone show me the code that would do this?