How to groupBy an Array of Objects and convert the duplicates

Question

Hello to all i have this data structure that i need to group and if there are any duplicates to convert those two objects it in one line..

Data Structure

var shipTo = [
  { addressLine1: "address 1", name: "Jeff" },
  { addressLine1: "address 2", name: "Taylor" },
  { addressLine1: "address 1", name: "Megan" },
  { addressLine1: "address 3", name: "Madison" },
];

Grouped function

function groupArrayOfObjects(list, key) {
  return list.reduce(function (rv, x) {
    (rv[x[key]] = rv[x[key]] || []).push(x);
    return rv;
  }, {});
}

I have groupedBy address attrube by this function above by address

const groupedAddress = groupArrayOfObjects(shipTo, "addressLine1");

My new data-structure is

My final Result wanna be like this :

Shipping Address for Shipment 1 & 3 is "address 1"

Shipping Address for Shipment 2 is "address 2"