Accessing metaobjects in Packing slip

I wanted to customize the packing slip, for that I wanted to access metafields in product level.
For me, product level metafield is of type metaobject.

Example -
1.Metaobject -
test_product_metaobject - this is my metaobject name and it contains test_product_metaobject.title field.

2.Metafield -
I have product level metafield - which is referrring to above metaobject

3.These values I need to use it in my packing slip
Sample code which I used

{% for line_item in order.line_items %}
    {{ line_item.product.metafields.custom.packing_slip_metaobject.value.title }}

    
    {% endfor %}

It will be very helpful, if you provide me how can I access this metaobjects in my packing slip
Thanks in advance.