Are there plans for a "Preview" option for the email editor in Workflow?

A lot of the emails in our workflows are sent to external parties, so we need to have a specific look-and-feel to them, with branding and external images (e.g company logos) achieved with lots of HTML and CSS.

Since the body of the email editor in Workflow Designer is just a text editor, we are having to craft the emails in external tools, then copy-paste them to the email editor. This ends up being very tedious and time-consuming (especially if changes need to be made to existing email activities later).

It would be great if Workflow gave you the ability to preview how the email will look in popular email clients like Outlook and Gmail. That would remove several steps from our development process.