How do I use Group argument in extension action function?

I am trying to use a Group as an argument to an extension action function.
And in the extension function, I want to create an object in the group with the “Among objects, Group create object named” action.

However, it seems that passing Group as an argument to the extension action function is not working well.
So, creating an object in the group is not going well too.

Is there any way to pass Group argument to extension action function?

json to reproduce:

I really don’t know how help you, but your console.log function is very comfortable for me.

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I haven’t opened your json, but object groups are here: