How can I improve the Schema.org markup for my Shopify products to include additional review properties, product-specific variables, and aggregate review data?
{% if product.reviews.size > 0 %}
{% assign ratingCount = product.reviews.size %}
{% assign ratingValue = 0 %}
{% for review in product.reviews %}
{% assign ratingValue = ratingValue | plus: review.rating %}
{% endfor %}
{% assign averageRating = ratingValue | divided_by: ratingCount %}
{% assign bestRating = 5 %}
{% assign worstRating = 1 %}
{% endif %}