Comment 7 for bug 2001708

It sounds like gdk_pixbuf_init_modules would be fine, there's no issue putting the library in the snap under a known path. But the logic to generate the loaders.cache would only ever point to the Gnome snap, which is why just bundling it alone didn't work.

I have also proposed this to the Gnome snap, which I'm hoping would also work.
https://github.com/ubuntu/gnome-sdk/pull/96