Yes, it should be possible. You need to figure out the seed package for the respective flavor is called. For UCC3 we use
ubuntu-desktop. Add the package(s) required for the desired flavor into an image config file and remove
ubuntu-desktop. Then, create a new image. See the docuemntation for more information.
EDIT Someone with more knowledge than me pointed out, that Manjaro is an Arch LInux based distro. The UCC tools are heavily based around the debian package architecture. That means, it will not work for distributions that are not based on debian.
By the way, you can now easily join Ubuntu systems into a UCS domain with our new Domain Join Assistant