Captcha on custom page?

I am wondering if it is possible to use the built-in captcha on custom pages, using the settings in the admin area.

Currently I have it set to show the captcha unless a user is logged in. I want to be able to add a captcha code to a custom page I created in WHMCS.

I know how to add my own third-party captcha, but am looking to use the built-in one.

Is this possible?