dependencies only package?

[Roger Pack]

Hello.
My desire/wish would be a command something like
$ sudo port mpkg ffmpeg gocr --output-name
my-big-package-containing-both-gocr-and-ffmpeg

Since that doesn't seem an option, I was thinking/hoping I could write
something like a Portfile that *just* have dependencies on gocr and
ffmpeg, then I could mpkg that for the same effect.
Is anything like that currently possible?
Thanks!
-roger-