Mobian is an overlay for Debian Bullseye, so for the latter you would have to follow Debian's process. For Mobian specific packages I would open an issue on their GitLab tracker.
Edit: Mobian specific info on how to add packages can be found here (package must be reviewed by 1 Debian developer, 2 Debian maintainers and 4 Mobian maintainers).
Edit: Mobian specific info on how to add packages can be found here (package must be reviewed by 1 Debian developer, 2 Debian maintainers and 4 Mobian maintainers).