Install CKEditor 5 build with file manager as a Drupal module
CKEditor 5 is the WYSIWYG editor included in Drupal 10 by default and could be enabled in Drupal 9 manually. Flmngr file manager supports any of these versions of Drupal and provides a module.
The installation is simple (like any other Drupal plugin), both CKEditor 5 plugin and PHP backend will be installed at the same moment and linked with each other.