Where can you get it from and what does it cost?
This is a bit more complicated because it is not necessarily 100% a shader. What you see there's software from Nvidia that you can use with your desktop and graphics card. You need one of the newer RTX graphics cards from Nvidia. I hope I could help you here again a link. :
It looks like https://www.sonicether.com/seus/#downloads to me.
What the FS sent is 100% a shader, since it is the Java Edition. However, RTX is only supported by the Bedrock Edition. So it's 100% a shader.
I have a RTX 2060 Super you mean that is not enough?