Save WooCommerce OrderData in ACF Field

My goal is to save WooCommerce order data into an ACF Field in the backend of WordPress. For this project every order which is completed generates a new post in my custom post type named ‘groeiprocessen’. The code for this function looks like this and works perfectly.

—-

function create_post_after_order( $order_id ) {
if ( $order_id instanceof WC_Order ){
return;
}

$order = wc_get_order( $order_id );
$order_items = $order->get_items();

foreach ( $order_items as $item_id => $item_data ) {
$product = $item_data->get_product();
$content.= $item_data->get_quantity();
$content.= $product->get_name();
}

$new_post = array(
‘post_title’ => “Order {$order_id}”,
‘post_content’ => $content,
‘post_status’ => ‘private’,
‘post_date’ => date(‘Y-m-d H:i:s’),
‘post_author’ => $user_ID,
‘post_type’ => ‘groeiproces’,
‘post_status’ => ‘publish’,
);
$post_id = wp_insert_post($new_post);
}
add_action( ‘woocommerce_thankyou’, ‘create_post_after_order’, 10, 1 );

—-

Right now the product name and quantity gets saved in the post content.

As you can see I created to ACF Fields under the content field. Now my question is: How can I save the quantity data for the right product in the ACF Fields under my post?

Field ID’s
acf-field_6163f2e1542e1
acf-field_61640103002c9

Field names
acf[field_6163f2e1542e1]
acf[field_61640103002c9]

I would really appreciate the help. Thanks in advance!