Actually it is possible with the help of 2 tiny plugins, and a little bit of imagination !
1. The block(s) that are going to be used in TinyMCE must be Reusable ones. So step one is to create the Reusable blocks…
2. Install the plugin “Block Widget” (https://wordpress.org/plugins/block-widget/), this will put a Reusable block in a widget (and only a reusable block) – this is the reason step one was needed.
3. Install the plugin “Widget Shortcode”, get the shortcode for the Nlock Widget from step 2, and place it in your editor.
Still don’t believe me? Watch this … https://www.youtube.com/watch?v=OI4Fe6XZmag&feature=youtu.be
