On this page

{% for item in entry.contentBlocks[blockIndex:]|filter( i => i.type.handle == "heading" and i['showInTableOfContents']|default(1) ) %}
• {% import "macros" as macros %} {{ macros.icon("outline/arrow-down", "text-small text-gray-500 transition group-hocus:translate-y-1") }} {{ item.heading }}
{% endfor %}