Правильно ли я понимаю, что этот плагин не нуленый и репа недоступна?

This plugin can add and edit all code such as css, php, java. By installing this plugin, you no longer need the existing customCSS&JS and Snippets plugins!
And it's easy to use!

Code Snippets Pro v3.2.0

https://codesnippets.pro/

This plugin might be the best. waiting.

Code Snippets is an easy, clean and simple way to run code snippets on your site. It removes the need to add custom snippets to your theme’s functions.php file.

Code Snippets Pro is now available, with full CSS, jаvascript, Gutenberg and Elementor integrations.

A snippet is a small chunk of PHP code that you can use to extend the functionality of a WordPress-powered website; essentially a mini-plugin with less load on your site.

Most snippet-hosting sites tell you to add snippet code to your active theme’s functions.php file, which can get rather long and messy after a while.

Code Snippets changes that by providing a GUI interface for adding snippets and actually running them on your site just as if they were in your theme’s functions.php file.