https://snapcraft.io/xnviewmp
Doesn't look like it's official. I'm not sure how I should feel about a 3rd party being involved. Is this sanctioned by the developer?
XnView MP on the Ubuntu Snap Store
Moderators: XnTriq, helmut, xnview
XnView MP on the Ubuntu Snap Store
Get the bugs fixed, THEN start adding features. It sucks, but someone has to do it.