This Shortcode element lets you insert and render any WordPress shortcode inside Mosaic, just paste the shortcode, and Mosaic outputs it on the front end.
Advanced tab settings

To add a WordPress shortcode to your page, simply paste the shortcode into its field. However, remember that the Style tab settings will also affect this element, so adjust them as needed. In the editor, you’ll only see the shortcode itself, not the content it loads. To view the actual result, preview it.
By default, the Shortcode element spans the full width of its parent. You can adjust its appearance in the Style tab.