Is it possible to update with column and variable using upsert?

Table:

id | quantity | product_id | user_id
1  |    1     |     1      |   1
2  |    4     |     2      |   1

I'm using upsert to insert or update bulk rows:

$products = [
    [
        'product_id' => 3,
        'quantity' => 2,
        'user_id' => 1,
    ],
    [
        'product_id' => 1,
        'quantity' => 8,
        'user_id' => 1,
    ]
];

Cart::upsert(
    $products,
    ['product_id', 'user_id'],
    ['quantity']
);

The above query results:

id | quantity | product_id | user_id
1  |    8     |     1      |   1
2  |    4     |     2      |   1
3  |    2     |     3      |   1

Is it possible to update the quantity with the old value + the new value instead of overriding it?

Desired result:

id | quantity | product_id | user_id
1  |    9     |     1      |   1
2  |    4     |     2      |   1
3  |    2     |     3      |   1