I use and love the Recent Topics block in the forum's sidebar, and that's precisely the block I want to use but in a WordPress post or page or any Gutenberg Editor (e.g., custom post type's content).
How can that widget/block appear in the Gutenberg editor of posts and pages?
Hi @lazilaz,
You can use amr shortcode any widget plugin to create a shortcode of the needed widget and then create a shortcode block in the post content and insert the widgets shortcode there.
For anyone else who stumbles onto this in the future, I followed this post from WPMU.
https://wpmudev.com/blog/widgetize-page-post-template-wordpress/
I'd rather use a Gutenberg block but I settled with modifying my template and adding widget areas. It's a little technical and doesn't have the flexibility of a block but it works.