Preview blocks plugin

Have grav some functionality or plugins for automatic generate preview blocks of site pages?
(sorry for English)
Something like this

Hi @Lonely, I use the embed.ly service for this type of thing:
https://embed.ly/

In my Bootstrap4 Open Matter theme I also have a custom page type to support this via page frontmatter.

Example demo page:
https://demo.hibbittsdesign.org/grav-open-matter-course-hub/all-readings

Example Twig:
https://github.com/hibbitts-design/grav-theme-bootstrap4-open-matter/blob/master/templates/embedlycard.html.twig#L10-L11