I'm using WordPress "Twenty Nineteen" (child) theme. What I'm trying to achieve is to include one of my previously created Gutenberg Reusable Blocks as part of theme's index.php file.

The reason for that is to be able to quickly and easily edit what's displayed at the begginig of the homepage, right above the list of entries/posts.

In other words: is it possible to include previously created Gutenberg Reusable Block in php?