Question Help for Blending Camera in Shader Graph

Hello everybody.

Seeing this tutorial for Unreal, I want try it in Unity to start understanding the Shader Graph a little more. The problem I can't solve (until now) is the distance blending between of the two textures. Basically, in the tutorial you have the soft texture change using a Lerp function with the Alpha channel (see link) I "managed" to recreate the effect using the length node but I don't understand how to insert a "fade offset". Basically the blending starts from under my feet onwards, while I would like to determine the amount of the point. In addition, I notice that the textures overlap even after blending and I would like to avoid this.

Tips, suggestions, solutions?

Thanks for the attention

Here my Graph...


...and Shader in viewport

 

Any kind of help ??