Thank you for your response. The problem with the text column solution is that the user lose control over the composition of these fields, buttons etc. in the UI. Everything has to be define separately in the code, which is quite tedious. Mailchimp doesn’t provide a UI app to control the style of that form.

The newsletter plugin doesn’t work as expected as described on screenshots. Even in your provided example the mailchimp form should include fields “First Name” and “Last Name” but they are missing in tagdiv composer. How can I add these fields to my newsletter form?