Dragging ScriptableObjects into a graph view to create a node

I have a Dialogue Editor, in which I can create dialogue trees. This is done with an EditorWindow in which a GraphView is created. and in the Graph View, Nodes are created and connected to form the dialogue tree.

https://imgur.com/a/ryoyQRe

When a node is added to the nodeGraph, it creates a ScriptableObject which is where all the important information about dialogues are stored.

I want to be able to drag these scriptableObjects into the nodeGraph to create a node: https://imgur.com/a/ovzQvLJ

I know this will involve some form of eventhandler, but i am not sure how to handle drag-drop events with a graphview.