Nope. Not yet. A possibility in the future, but I don’t think it will support previews natively. As of now, you can work around this by using something like fzf, or even by dropping into ranger or something with a previewer when you need to see previews. You can even create a simpler previewer using hacks.

Not like ranger, but https://github.com/sayanarijit/xplr/pull/229 added support for FIFO based previewer.