Endgrain textures aren’t the hard part - it’s being able to get a good UV mapping especially for something that’s can’t be roughed in with a cubic map.
Hard when you’re working in Keyshot or most typical ID tools unless you export to an interim tool like Blender/Maya/Max to do the UV unwrapping.
This video seems to have a good overview of the process for Blender (which is free) if anyone wants to get fancy:
