WordPress Monsters

You can create templates (layout) for your pages to add some blocks of content before/after general content.
Also you can assign your template to custom post type(archive or single), taxonomies, 404 and search results pages, this options can be found in Templates->Settings menu in admin console.
You should use
<pre><code>[wpm-template-content]
</code></pre>
shortcode in this templates to separate content.
Watch how to use Template Manager plugin in this cute short video:
<iframe loading="lazy" title="Template Manager by WordPress Monsters" width="750" height="422" src="https://www.youtube.com/embed/jY2T-ZuUfSE?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>

Template Manager by WordPress Monsters

This is a temlate manager plugin for easy WordPress development from scratch when you are use Page Builders plugins.

Ben Huson

If you want to spice up your theme layouts this plugin will allow you to show different parts of your content in different area of your theme templates – break out of a single column of content.
More information can be found on the <a href="https://github.com/benhuson/content-parts/wiki" rel="nofollow ugc">Content Parts plugin page</a>.

Content Parts

Divide your post content into parts that you can show in different areas of your theme templates.

Template Manager by WordPress Monsters vs Content Parts