Please make an API connection with Thrive Themes. They are #1 visual editor for Wordpress. https://thrivethemes.com/

Many larger email marketing service providers have this, like Keap, Getresponse, Mailchimp etc. It helps so much with creating beautiful forms to grow our mailinglist.

Having to rely on a form created elsewhere, and needing to implement that as a code snippet on the site, just doesn't work well.

I am planning to keep using Sender for our large mailinglists, and for new websites in the future.

You can contact Thrive Themes here: https://thrivethemes.com/contact/submit/