Import Blender Nodes to Unity

First install Blender Addon Blender Nodes Graph > BlenderAddon > blender_unity_exporter.py in Blender.
Then in your Shader Editor Window click N to open node editor toolbar (a.k.a right menu) and click Node Exporter.

Click Export Node Graph and import generated .json file to Unity.

Finally drag and drop your .json file to Blender Nodes Graph Editor and connect desired sockets to Material Output.

Use Simple Noise Texture

Blender's default Noise Texture code is heavy. As far as I know Noise Texture uses Perlin Noise. But Simple Noise Texture uses Simplex Noise.

Show Unsupported Nodes

If you enable it, it shows unsupported nodes as sticky note in Unity. It can be useful in debug purposes.