Here comes a Gutenberg block to add some nice dummy text/filler text on the fly to your page/post. This is built by Roy Sivan @royboy789.
This block may come handy in different use cases such as to fill a mockup page with dummy text. There are not many options for now and it doesn&;t render the dummy content in the editor view. However, it output the filler content on the front-end fine. Of course, like any other Gutenberg plugin, this is also in Beta and we may expect improvements and updates in coming days.
A Quick look at Guten-Bacon
This is available