Email merge in Airmail for Mac (or iOS)

I have a bunch of Steam keys that I need to distribute to the students in my class (I teach a fun class), and I would like to send each of them an individual email with their key (long string of letters/numbers).

Is there a way to do this using any kind of automation in Airmail? I can type an email with text tokens and a CSV with the strings to replace, but I don’t know the best way to execute the actual send step. Is this something I should do with an Applescript?

(I’m ok with editing JSX scripts, but I don’t understand Applescript.)

PS - Bonus points if I can type the email in Markdown. I love the Markdown composer in Airmail.