If you want to add a module from the WPBakery page builder to your site you can do so in 2 ways:
Adding Via Shortcode
The first method is a bit of a pain in the butt but if you are just adding a simple module it’s easy and quick. Simply create a new blank page and add the module to the page. Then switch to the default editor and copy the shortcode and use this to paste in a “Text” widget.
Adding Via Templatera Widget (easier)
If you have the bundled Templatera plugin active on your site you can create a new template with the content you want to add to your widget area then you can use the Total Templatera widget to display that template in any widget area!