How can I add a new socket to the NODE GROUP FUNCTION Input node from a Python script?

[Sdphu]

I'm working on a Python script, and I'm using the node-groups-latest version.
Is there a way to execute the function that is triggered by the "+" button in the Properties panel from the script?

[pragma37]

Not directly, since it's a nested function, maybe I should move it to the class scope.
You can look at the source for reference:

Malt/BlenderMalt/MaltNodes/Nodes/MaltIONode.py

Line 188 in dfdb64d

def add_custom_socket():

It boils down to something like this:

parameter = node.get_custom_parameters().add()
param.graph_type = node.id_data.graph_type
param.is_output = node.is_output
param.io_type = node.io_type
param.name = "My Custom Parameter"
param.parameter = "vec3"