Issue #3404625: Added display of TWIG variables in the BodyEmailAdjuster.

src/Annotation/EmailBuilder.php

@@ -139,4 +139,14 @@ class EmailBuilder extends Plugin {
    */
   public $form_alter = [];
 
+  /**
+   * Array of variables to pass to the builder.
+   *
+   * The array key is the variable name.
+   * The array value is the variable description.
+   *
+   * @var array
+   */
+  public $variables = [];
+
 }