Karrde

Includes a file’s contents in the widget. Quick and dirty, all this does is use the PHP include function to include the specified file in the widget. There is NO checking done whatsoever on the file, so use it at your own risk. I wrote this because I couldn’t find a widget to do this ? plugins exist for using include in posts and pages, but not in widgets.

Include Widget

Includes a file's contents in the widget.

shawfactor

Include a comment form or listing on any post, page, or CPT inline in the post_content of another page.
Simply add the shortcodes lh_comment_form_shortcode_form or lh_comment_form_shortcode_list to you content in the editor. Both shortcodes have one mandatory attribute.
The mandatory attribute is post_id, this is the id of the post, page, or cpt whose comment form you want displayed.If that attribute i not specified it will defaut to the current page (which is not that useful)
eg [lh_comment_form_shortcode_form post_id=”100″] or [lh_comment_form_shortcode_list post_id=”100″]
A gutenberg block with this functionality will be added in time.
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LH Comment Form Shortcode and Block

Shortcodes to display comment forms and comment listings inline on any post, page, or cpt!

Include Widget vs LH Comment Form Shortcode and Block