Inject the TOC after the first H2 (Casper 5.4.4, Ghost 5.26.4)

Hi all, long time wordpress user and using Ghost since a week now on a new website, and fell in love with it. I’m content with the default theme “Casper”, that has more or less everything for what I need to do.

After following the very useful TOC installation guide from the official blog I can see that the table of contents it’s ten times better than the one you can obtain with the free Wordpress plugins.

I was wondering just one setting to make it more “SEO friendly”, since with the default settings, the TOC gets injected right after the title and before the content.
So my question is: how can I move the injection of the TOC after the first H2?

For reference, down here my current configuration of the post.hbs file:

{{!< default}}

{{!-- The tag above means: insert everything in this file
into the {body} tag of the default.hbs template --}}

{{!-- Everything inside the #post block pulls data from the post --}}

<main id="site-main" class="site-main">
<article class="article {{post_class}} {{#match @custom.post_image_style "Full"}}image-full{{else match @custom.post_image_style "=" "Small"}}image-small{{/match}}">

    <header class="article-header gh-canvas">

        <div class="article-tag post-card-tags">
                <span class="post-card-primary-tag">
                    <a href="{{url}}">{{name}}</a>
            {{#if featured}}
                <span class="post-card-featured">{{> "icons/fire"}} Featured</span>

        <h1 class="article-title">{{title}}</h1>

        {{#if custom_excerpt}}
            <p class="article-excerpt">{{custom_excerpt}}</p>

        <div class="article-byline">
        <section class="article-byline-content">

            <ul class="author-list">
                {{#foreach authors}}
                <li class="author-list-item">
                    {{#if profile_image}}
                    <a href="{{url}}" class="author-avatar">
                        <img class="author-profile-image" src="{{img_url profile_image size="xs"}}" alt="{{name}}" />
                    <a href="{{url}}" class="author-avatar author-profile-image">{{> "icons/avatar"}}</a>

            <div class="article-byline-meta">
                <h4 class="author-name">{{authors}}</h4>
                <div class="byline-meta-content">
                    <time class="byline-meta-date" datetime="{{date format="YYYY-MM-DD"}}">{{date}}</time>
                    {{#if reading_time}}
                        <span class="byline-reading-time"><span class="bull">&bull;</span> {{reading_time}}</span>


        {{#match @custom.post_image_style "!=" "Hidden"}}
        {{#if feature_image}}
            <figure class="article-image">
                {{!-- This is a responsive image, it loads different sizes depending on device
                    srcset="{{img_url feature_image size="s"}} 300w,
                            {{img_url feature_image size="m"}} 600w,
                            {{img_url feature_image size="l"}} 1000w,
                            {{img_url feature_image size="xl"}} 2000w"
                    sizes="(min-width: 1400px) 1400px, 92vw"
                    src="{{img_url feature_image size="xl"}}"
                    alt="{{#if feature_image_alt}}{{feature_image_alt}}{{else}}{{title}}{{/if}}"
                {{#if feature_image_caption}}


    <section class="gh-content gh-canvas">
    <aside class="gh-sidebar"><div class="gh-toc"></div></aside> {{! The TOC will be inserted here }}

    {{#if comments}}
        <section class="article-comments gh-canvas">


{{!-- A signup call to action is displayed here, unless viewed as a logged-in member --}}
{{#if @site.members_enabled}}
{{#unless @member}}
{{#unless @site.comments_enabled}}
{{#if access}}
    <section class="footer-cta outer">
        <div class="inner">
            {{#if @custom.email_signup_text}}<h2 class="footer-cta-title">{{@custom.email_signup_text}}</h2>{{/if}}
            <a class="footer-cta-button" href="#/portal" data-portal>
                <div class="footer-cta-input">Enter your email</div>

{{!-- Read more links, just above the footer --}}
{{#if @custom.show_recent_posts_footer}}
    {{!-- The {#get} helper below fetches some of the latest posts here
    so that people have something else to read when they finish this one.

    This query gets the latest 3 posts on the site, but adds a filter to
    exclude the post we're currently on from being included. --}}
    {{#get "posts" filter="id:-{{id}}" limit="3" as |more_posts|}}

        {{#if more_posts}}
            <aside class="read-more-wrap outer">
                <div class="read-more inner">
                    {{#foreach more_posts}}
                        {{> "post-card"}}