Linked from: https://support.boldcommerce.com/hc/en-us/articles/210227183-Product-Comparison-Install-Instructions

bold-compare-specs-liquid

{% assign bold_product = bold-compare-specs %}
{% assign bold_metafield = bold_product.metafields.bold_spec %}
{% assign bold_meta_size = bold_metafield | size %}
{% if bold_meta_size > 0 %}

<div class="bold_specs" style="display:none;">
    <table class="bold_spec_grid">
        <thead>
        <tr>
            <th><script>document.write(BOLD.Compare.language.spec_title);</script></th>
            <th><script>document.write(BOLD.Compare.language.spec_detail);</script></th>
        </tr>
        </thead>
        <tbody>
        {% assign bold_metafield = bold_product.metafields.bold_spec %}
        {% for bold_spec in bold_metafield %}

        <tr>
            <td>{{bold_spec.first}}</td>
            <td>{{bold_spec.last}}</td>
        </tr>
        {% endfor %}
        </tbody>
    </table>
</div>
{% endif %}