Using ESI in shortcode

Hi,

I want to exclude my contact form from caching and I’ve read in this article I can simply add esi + ttl="0" to the shortcode, if plugin does support it.

If I understand correctly I can make the plugin support this, by adding this to the main plugin file:

method_exists( 'LiteSpeed_Cache_API', 'purge' ) && LiteSpeed_Cache_API::purge( 'esi.my-shortcode' ) ;

Is this correct or should I do more, regarding the plugin?

Guido