getting linklist json in shopify through liquid

linklist.liquid

{% layout none %}



{
"parent":[
{% for link in linklists.main-menu.links %}
    {% if link.type == 'collection_link' %}
        {% assign parentObj = link | map: 'object' %}
        {% assign parentId = parentObj[0].id %}

        {"id":"{{ parentId }}", "title":"{{ link.title }}", "handle":"{{ link.handle }}"}
    {% else %}
		{}
	{% endif %}
    
    {% if forloop.last == false %},{% endif %}
{% endfor %}
],

"child":[
{% for link in linklists.main-menu.links %}
    {% if link.type != 'collection_link' %}
        {% continue %}
    {% endif %}

    {% assign parentObj = link | map: 'object' %}
    {% assign parentId = parentObj[0].id %}
    {% for child in link.links %}
        {% assign childObj = child | map: 'object' %}
        {"id":"{{ childObj[0].id }}", "parent_id":"{{ parentId }}", "title":"{{ child.title }}", "handle":"{{ child.handle }}"}
        {% if forloop.last == false %},{% endif %}
    {% endfor %}

    {% if link.links != blank %}
        {% if forloop.first == true %},{% endif %}
    {% endif %}
{% endfor %}
],

"sub_child":[
{% for link in linklists.main-menu.links %}
    {% if link.type != 'collection_link' %}
        {% continue %}
    {% endif %}

    {% for child in link.links %}
        {% assign childObj = child | map: 'object' %}
        {% assign childId = childObj[0].id %}
        {% for subChild in child.links %}
            {% assign subChildObj = subChild | map: 'object' %}
            {"id":"{{ subChildObj[0].id }}", "parent_id":"{{ childId }}", "title":"{{ subChild.title }}", "handle":"{{ subChild.handle }}"}
            {% if forloop.last == false %},{% endif %}
        {% endfor %}
        {% if forloop.last == false %},{% endif %}
    {% endfor %}
{% endfor %}
]
}