How to access the Landscape texture?

Hello, according to the official Unreal documentation on Landscapes: "On most platforms, the Landscape system stores the render data for the terrain in Textures in GPU memory, allowing data to be looked up in the vertex shader. The data is packed into a 32-bit Texture with the height occupying 16-bits in the form of the R and G channels and the normal, stored as 2 8-bit values for X and Y, occupying the B and A channels, respectively."

My question is: how do I access that texture?? What is the node I should use on my material graph to access that texture which contains the landscape information?