Content blocks: display content block type in document editor

The document editor doesn't display the type of a content block. This makes it difficult to scan the document in the editor when adding multiple content blocks. It would be very helpful if each content block would have a configurable option to display its type as a label. See the screenshot "Hippo CMS 7.png" as an example from a project.

The label could be the name of the contentblock with possibly a postfix "Contentblock: " to make clear this concerns a contentblock. Some visual cue as to where one content block ends and another begins would also help when scanning the document.