Issue #3364917 - Add attributes

Closes #3364917

config/schema/manage_display.schema.yml

@@ -4,6 +4,9 @@ field.formatter.settings.title:
     tag:
       type: string
       label: 'Tag'
+    attributes:
+      type: string
+      label: 'Title attributes'
 
 field.formatter.settings.submitted:
   type: mapping