The Flatpak is already packaged and works well. It just needs to be maintained from a person that joins the Inkscape community.
This would allow further improvements like Portal support and making the app official on Flathub.
Update: One might have been found!
For what it is worth you can install Snap on most distros. https://snapcraft.io/docs/installing-snapd
but you shouldnt because snap’s "strict confinement’ sandbox feature does not work without the legacy patches to Apparmor that ubuntu uses.
Snap is a cesspool for malware and shovel ware. The best apps are packaged by Canonical. Also, when people still cared about Snap, there were frequent reports of incompatibilities because it was developed with Ubuntu in mind.