Create resource for email marketing

I'm almost finished with my SaaS project, and one of the things I'm including is the option to do email marketing. That is, to be able to create email campaigns and send them from a Filament resource. My question is if there is or do you recommend a way to do this, and where I can have an editor or preload a template with pre-made designs... I'm thinking about asking an AI like Claude or ChatGPT to create some templates for me, but I don't know how I could do it so they're editable and can be previewed by the user. Maybe my question is a bit confusing, but finally, any ideas or recommendations would be great. I want this part to be extremely easy for the end user as well, since the first image gives the option to customize or create something like that on the same page. And if I can make this easy for my client, it will be so much better... My idea is to make it as easy as possible for my client. I think I could set up some fixed fields using image, textarea, and text input types, and just change some predefined designs that I could add in the future. I could start with 3 or 4 but offer more designs to my clients later. This way I make my client's life much easier with email marketing.