How to cutout shadows from image directly from 3ds max

Hello, I am doing some renders in 3ds max with corona render, I need to export images (image 1) without background and with shadows, I know how to do this on photoshop but it takes a lot of time. I have lots of them. I will appreciate any help.

Thanks

corona shadow catcher mtl 

https://3ddd.ru/forum/thread/show/corona_shadow_catcher_mtl_ili_prozrachnyi_fon_s_sokhranieniiem_tieniei 

thank you very much, this one worked for me.

awesome, thanks