No, there is no such ShortCode in the Toolset Plugins.
The only way, currently, is to use native HTML comments syntax.
However, it would be possible to register such a ShortCode yourself in a Custom Plugin, or in your Theme's functions.php File.
You'd follow this WordPress Codex:
https://codex.wordpress.org/Shortcode_API
You could simply let the ShortCode return your HTML comments, or even create an enclosing ShortCode, where you can wrap inserted contents with your custom HTML (such as you depict it in your comment above).
An example, you can add such 2 functions to your site:
function html_comment_start_func( $atts ){
return "<!--";
}
add_shortcode( 'html-comment-start', 'html_comment_start_func' );
function html_comment_end_func( $atts ){
return "-->";
}
add_shortcode( 'html-comment-end', 'html_comment_end_func' );
Later, apply those ShortCodes like this:
This is the shown content
[html-comment-start]This is the hidden content[html-comment-end]
It will result in this HTML:
This is the shown content
<!--This is the hidden content-->
Or, you can create an enclosing ShortCode:
function html_comment_func( $atts, $content = null ) {
return '<!--' . $content . '-->';
}
add_shortcode( 'html-comment', 'html_comment_func' );
And then use that like:
[html-comment]This is the hidden content[/html-comment]
I hope that helps.
I don't think we will implement that in the GUI as the request is not yet very popular (it's the first time we receive it until now), and it is relatively trivial to create a own ShortCode.
However, if you wish I can let the Developers consider a new feature that would allow this with the GUI.
