Wordpress and Mailchimp Campaigns


Does anyone know how to create/update a Mailchimp campaign using a Wordpress Post?

I want to create my MC email template in Wordpress and send this via make.com (using the Mailchimp campaigns) Why? I only want to create my newsletter once in WP and not in MC.

I do know how to create MC campaign template.

See Screenshot.

I cant work out how to get the body content from the Wordpress Post into a MC campaign template? Is this done in create campaign? Update campaign or Edit template?

Please only reply if you know how to do this.

Support never answer any questions so I am hoping you can help. Thanks