{% set values = entity.instance.attributeValues|filter(av => av.value != '') %}
<details>
    <summary style="cursor:pointer;user-select:none;">
        {{ values|length }} Attribute
    </summary>
    <table style="margin-top:.5rem;border-collapse:collapse;width:100%;">
        {% for av in values %}
        <tr>
            <td style="padding:2px 12px 2px 0;font-weight:600;white-space:nowrap;vertical-align:top;">{{ av.attributeDefinition.name }}</td>
            <td style="padding:2px 0;vertical-align:top;">{{ av.value }}</td>
        </tr>
        {% endfor %}
    </table>
</details>