Feature request: hide mailing list sections

I no longer use MailChimp (in years), and I recently switched from MailerLite to Kit. Since I can’t set Kit as the automatic email client through the plugin, I’d love to be able to hide those sections. Or, add Kit as an integration. I also can’t add Kit forms into the “About the Book” section because it no longer allows HTML or JS from all my testing the past week—what happened there?