Capture purchases with multiple items

Hi all,
we are using GA4 at the moment as our tracking solution and are pushing all necessary product information to the datalayer when the purchase is done. Our datalayer push looks like that:

dataLayer.push({ ecommerce: null }); // Clear the previous ecommerce object.
dataLayer.push({
event: "purchase",
ecommerce: {
transaction_id: "T_12345",
value: 25.42,
tax: 4.90,
shipping: 5.99,
currency: "USD",
coupon: "SUMMER_SALE",
items: [
{
item_id: "SKU_12345",
item_name: "Stan and Friends Tee",
affiliation: "Google Merchandise Store",
coupon: "SUMMER_FUN",
discount: 2.22,
index: 0,
item_brand: "Google",
item_category: "Apparel",
item_category2: "Adult",
item_category3: "Shirts",
item_category4: "Crew",
item_category5: "Short sleeve",
item_list_id: "related_products",
item_list_name: "Related Products",
item_variant: "green",
location_id: "ChIJIQBpAG2ahYAR_6128GcTUEo",
price: 9.99,
quantity: 1
},
{
item_id: "SKU_12346",
item_name: "Google Grey Women's Tee",
affiliation: "Google Merchandise Store",
coupon: "SUMMER_FUN",
discount: 3.33,
index: 1,
item_brand: "Google",
item_category: "Apparel",
item_category2: "Adult",
item_category3: "Shirts",
item_category4: "Crew",
item_category5: "Short sleeve",
item_list_id: "related_products",
item_list_name: "Related Products",
item_variant: "gray",
location_id: "ChIJIQBpAG2ahYAR_6128GcTUEo",
price: 20.99,
promotion_id: "P_12345",
promotion_name: "Summer Sale",
quantity: 1
}]
}
});

How can we reuse this datalayer push to capture the purchase with the Amplitude GTM template. As seen in the screenshot somehow it is only possible to capture one productId, one price and the revenue.

Help would be greatly appreciated.