enduro2d/samples/bin/library/prefabs/panel_prefab.json

{
    "prefab" : "sprite_prefab.json",
    "components" : {
        "named" : {
            "name" : "panel"
        },
        "sprite_renderer" : {
            "mode" : "sliced",
            "sprite" : "../sprites/panel_sprite.json"
        }
    }
}