Entity Linking for Receipts

I am building a model for reading receipts from their mobile snapshots. After the receipt is OCR'd, I plan to use a variation on LayoutLM for entity extraction. Entities are: quantity, price-per-unit, product-name, items-price, etc.

What is the best model to consider to link all these entities into a single receipt item, so the final result looks like:

items: [
   {product: ...,
    unit_price: ...,
    price_paid: ...,
    quantity: ...,
},
...
]