This is WorldAnvil and world-building; how can this not be wanted? Every 2d to 3d map conversion distorts to some degree. The closest, but still faulty, is: https://geektech.me/the-first-accurate-map-of-the-world-was-created-whats-wrong-with-everyone-else/ Imagine editing a sphere, know coordinates/distances/altitude/depth, and track changes over time. Anyone can make a calendar/family tree. Professionals debated map projections for centuries, even now.
That would mean a hell lot of development for a very minor usage. And be extremly ressource intensive to boot. not feasable in my mind
https://www.maptoglobe.com/ lets you take a 2D map and make is Spherical. It will them even generate screenshots at 180,90, or 45 degrees. You could then use the 2d screenshots in WA. Not worth the development time to implement.
Gprojector is a free program published by NASA that will take almost any input image and convert it into any of 200 different map projections. GPlates is another free program that will convert any flat image into a spherical shape that you can zoom and rotate (among a lot of other features but that aside). Programs to view 2D maps as spheres already exist and they are free for everyone to use. There is no need for World Anvil to spend thousands of hours figuring out things other programs already do. Also, yeah, there is project Deios that will have 3D projections, but I'm not sure that is going to be functionally different than using existing programs unless you can edit in full 3D.
I'd love that, but I suppose that won't come before Dungeonfog's Project Deios is finished and integrated with WA. 3D projection is announced for Deios, and to me it makes more sense to let them handle that.
This is so far out of the scope of world anvil. I am not sure if it should be a thing. This feels more like a map making software request like for Project Deios than World Anvil (which I am all for)
Displaying a 3d object instead of a 2d object is an enormous change and would likely require a completely new map system. So I'd rather not see that time invested. Projects are a good enough tradeoff imo