[Maya] Making a Transform node as input for deformer?

Hi,

So this question may sound confusing, but basically I have a custom deformer node, and I want one of its inputs to be a transformer node, which in my case would just be a grouo node. The deformer I have needs to get a list of the group nodes children, getting information and such. The only problem is I can’t find a data type that accepts just connecting a transform node. Is there a way to do this that I’m just totally missing?

Thanks in advance!
EDIT: Also this is in C++.