Test

config/config.yml.dist

-# Default path
-default_file_path: "files"
+plugins:
+- dialog
+- colordialog

src/CkEditorEmbedPluginsExtension.php

@@ -38,13 +38,15 @@ class CkEditorEmbedPluginsExtension extends SimpleExtension
                 ->setZone(Zone::BACKEND),
             Snippet::create()
                 ->setCallback([$this, 'loadConfig'])
-                ->setLocation(Target::AFTER_META)
-                ->setPriority(5)
+                ->setLocation(Target::BEFORE_BODY_JS)
+                ->setPriority(999)
                 ->setZone(Zone::BACKEND),
         ];
     }
 
     public function loadConfig() {
-        return '<meta name="ckeditor-config" content="plop, coin, plopcoin" />';
+        return '<script type="text/javascript">
+            const ckeditorPlugins = ['.$this->getConfig()["plugins"].'];
+        </script>';
     }
 }