Captcha can't be enabled conditionally

Captcha can't be enabled conditionally

Hi
Problem: captcha on a form can't be enabled conditionally.
Why is this a problem: Because I use the same form on our website (public) in the portal and mobile app.

In the portal it works but in the mobile app it doesn't.
So there should be a way to enable the captcha conditionally.

Any way to make it happen?