Add extra xml that will be appended to each product. For example <delivery>10</delivery>
You can also set condition for which product it will work, for example product tag, or type
You can use short codes, for example [[title]] [[sku]] [[barcode]]. They will be replaced with product data
For product metafields use [[p.mf.key]] Replace key with metafield key. For variant use [[v.mf.key]]