Best way to save/load new graphs at runtime?

[afex]

I'm experimenting with using the runtime graph and processing components to allow players to create new graphs via a simplified UI.

my first thoughts were to see how to grab a graph asset at runtime which i had previously made in the editor, and save everything necessary into a local file in order to re-construct it by hand. given the recent [SerializeReference] changes, i'm not sure what the best path forward for me to play around here is. (previous attempts were based on now-obsolete fields)

is there a standard technique to turn json generated from [SerializeReference] fields directly back into C# objects or should i plan on parsing the json manually? will this approach have any upcoming blockers which i'm not seeing yet?

i also notice that the project list contains the entry API to create graph from C# and at runtime. this sounds like it lines up with my use case, but i'm curious how this is different than using code like this?

MyGraph myGraph = ScriptableObject.CreateInstance<MyGraph>();

MyNode myNode = BaseNode.CreateFromType<MyNode>(Vector2.zero);
myGraph.AddNode(myNode);

MyOtherNode myOtherNode = BaseNode.CreateFromType<MyOtherNode>(Vector2.zero);
myGraph.AddNode(myOtherNode);

myGraph.Connect(myNode.inputPorts[0], myOtherNode.outputPorts[0]);