WordPress provide shortcode functionality. You can create your own shortcode and put it any page to show you shortcode content.

Check below example for creating shortcode :

/** Html Code **/

function my_html_code_fun( $atts ) {
  $html = '<div>';
  $html .= '<p>Hello World</p>';
  $html = '</div>';
  return $html;
}

/** Create Shortcode **/
add_shortcode( 'my_html_code', 'my_html_code_fun' );

Now you have to add [my_html_code] shortcode in page’s/post’s editor & save page/post.

You can add above code in your plugin.

Check link for other info about shortcode.

Hope this will helps you.

Thanks.