How to pass data to theme blocks with content_for?

Online Store and Theme Development
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1

I am modifying the horizon theme and want to pass some data to blocks rendered using content_for 'blocks'. Unlike content_for 'block', 'blocks' doesn’t allow multiple closest variables or custom data to be passed. What are the workaround for this?

For example, below I want to pass the variant (or the variant id) to the blocks included within the product card:

{% liquid
  assign product = closest.product
-%}

{% capture children %}
  {% content_for 'blocks', closest.product: product %}
{% endcapture %}

{% render 'product-card', children: children, product: product %}

This doesn’t work:

{% content_for 'blocks', closest.product: product, variant_id: variant_id %}

But this does:

{% content_for 'block', type: '_product-card', closest.product: product, variant_id: variant_id %}