Shadow Transparent Receiver - any way of doing it with LWRP?

We've been trying to reproduce this shader in LWRP for days still no good results or any result at all with other examples found of internet.

I'm not a shader guy, this is all super weird and frightening so if someone could help us to at least understand whats going on or what should we do.

we're using 2018.2.19f at the moment.

This is the best example I could find on the web of what we need

https://github.com/keijiro/ShadowDrawer

 

@metalkat Hi, do you found a way to move this shader to LWRP?)