This bundle OperaTextBlockBundle will help you to easily manage static texts usefull to add some js, static content like ads, or image…

Installation

composer require opera-project/text-block-bundle

Want a ckeditor because static html is not so funny ?

composer require friendsofsymfony/ckeditor-bundle
php bin/console ckeditor:install
php bin/console assets:install public

And after ?

Thats all refresh your admin and you will see the text block is ready to use !!