how can I add dynamic variables in email layout?

[SheltonT]

We created an email layout to set the email header & footer to keep a consistent design across notifications. 

In the email layout we added the variable  ${notification:body} for the email body placing it between the header & footer.

Is it possible to add other variables? We want to have a dynamic first line on the email layout so the email preview in outlook/gmail/etc. shows something. We tried  ${notification:subject} but when previewing the email notification the body will no longer show upon adding this. 

[jcmings]

Have you tried to create an email template? You can set up the template with the header and footer and the content will insert within.

[SheltonT]

Teh email layout is used within the email template. So have that set-up. What i am looking to do is have a dynamic first line on the beginning of the email above the header so it appears in the email preview. I am hoping there is a variable or something we can use to do that similar to how you insert ${notification:body}

What is in red text in the first image below is what I want to add to the email layout/template but make dynamic. This is what shows in the email preview (pointed at in green in the second image)

[jcmings]

Thanks for the high-detail screenshots. A+ question asker!

You could probably set up something like a mail script to conditionally show different content in the first line.

[JohnnySnow]

@SheltonT Is this subject same across all the notification? If not then create a mail script and try to set the dynamic subject using email.setSubject.