Build debian and windows images for Ubuntu MAAS

Hi dear,
I’m new with packer and this is my first post here…
I’m trying to undestand the procedure to create an image via Packer, I’m seeing that it’s possible create a images for different builder but not for Ubuntu MAAS, someone can help me to create a template for Debian and Window 2019 Server for MAAS? I know that exist a product for that released of Ubuntu but it’s a paid…
Thanks in advance.