I had a quick nose of that plugins documents, it seems you would have to use the plugin to create a shortcode to add to the block editor.
Alternatively i found this single block plugin that seems to do a similar thing:
Thanks much for following up. May options out there of course but I had paid for this particular plugin. However when I went the link to that site I got the message:
This Account has been suspended. Not a good sign.
I will take a look at the other app you mentioned as