The only way I've been able to achieve this in the past (with other renderers) is creating a pass manually, where you left the glass with it's glass material but without any reflection, just refraction, everything else in black and the desired object in white, try to eliminate any GI, bouncing or similar to avoid the teapot to emit light, enable self illumination and that's it.
I'm not sure this can be done in Corona, becuase it's unbiased nature, but it's probably possible reducing bounces and such things, I did it in the past with iRay, so it should be possible in Corona, but it's a manually created pass, nothing with render elements.
Cheers.