line_item_properties_without_variants.liquid

THIS DOES NOT WORK FOR ALL THEMES AND IS NOT MEANT TO COPY PASTE,
YOU HAVE TO USE IT AS GUIDE FOR YOUR OWN IMPLEMENTATION

<div id="bundles_child_products" style="display:none;">

{% for variant in product.variants %}
  {% if variant.metafields.bundles_app.content.size > 0 %}
      {% assign lines = variant.metafields.bundles_app.content %}
      {% for line in lines %}
        {% for fields in line %}
          	{%if fields[0] == 'title'%}
        		{% assign title = fields[1] %}
        	{%endif%}
        	{%if fields[0] == 'sku'%}
        		{% assign sku = fields[1] %}
        	{%endif%}
        	{%if fields[0] == 'quantity'%}
        		{% assign quantity = fields[1] %}
        	{%endif%}
        {% endfor %}
        <input id="bundle-child-product-{{ forloop.index }}" type="hidden" name="properties[_Product {{ forloop.index }}]" value="{{quantity}}x {{title}} ({{sku}})">
      {% endfor %}
  {% endif %}
{% endfor %}

</div>