Ckeditor table customization?

Question

JavaScript

Good afternoon. Faced such a problem.
When you try to insert a table in ckeditor, it inserts a standard table. This table is located in the iframe and it is impossible to influence it from the outside.
How to add a default class for a table. So that when creating a table without specifying a class, a standard class is added to the table, and if you add a class in the options, then the class added by the user will be added to the existing one.