How to create an AnimNode?

Hello everyone
I want to create an AnimNode.
I found some tutorials like this one,_Code_for_How_to_Create_Your_Own
I created a class that inherit from “UAnimGraphNode_Base” , but the problem I don’t know how to create a USTRUCT that inherits “FAnimNode_Base” .
According to what I understood from the tutorial this is a key step to get the node on the animation graph.

So my question is How Can I create a ustruct that inherts from “FAnimNode_Base”.
Thank you