How do I render a jpg image using ARKit ARSKViewDelegate?

I'd like to render a jpg image as a 2d rectangle floating in space. Using the SpriteKit example - how do I return a jpg image from the ARSKViewDelegate?

The demo returns a SKLabelNode - is there a Node class that would be appropriate for a jpg image that I would fetch from the network, maybe a UIImage?

func view(_ view: ARSKView, nodeFor anchor: ARAnchor) -> SKNode? {
    // Create and configure a node for the anchor added to the view's session.
    let labelNode = SKLabelNode(text: "")
    labelNode.horizontalAlignmentMode = .center
    labelNode.verticalAlignmentMode = .center
    return labelNode;
}