No. You would need to generate a cubemap through code using a secondary (or code-generated) camera. Or you could use a reflection probe, as this is pretty much exactly what they do behind the scenes.
is an AR project, i try reflection probe but does not work. I need to reflect the image of the camera, in to the 3d model.
i put to the 3D object, Add component/Rendering/Reflection Probe, put Type in custom, but the same problem, it ask for a CubeMap. Should be a manner to put the camera image into the Cube Map