Adding to login- and/or custom template

I would like to add this CAPTCHA to the joomla login form. I already have it working well for registration.

I have custom HTML in my template for the login.

Is there a way to add it to login, with or without custom HTML?

I have tried another CAPTCHA in the past which provided PHP code that I added to the template, so if there is code I could add display the CAPTCHA, I can do it. I could also stop using my custom template if needed,but since your CAPTCHA works with my custom registration form, it would probably work with login, if you added that.

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