Gutenberg - Shortcode preview with dummy data

[itssimple]

As a WordPress-author/contributor, I would like some easy tools to use when I design my custom template to display my courses.

If possible, I would also like a preview-method, so I can see what the page would look like before I publish it.

[multinet-pmerk]

With WP 5.0 and the built in page block editor (Gutenberg) this is not really necessary.

Preview that replaces shortcodes with dummy data would be nice though!