Get nodelet running instance

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I am new of ROS and nodelet. I understand that we can use nodelet load to load a nodelet make it running or load with Loader. And we can do sub-pub in loaded nodelet.

Is it possible I can get the running nodelet instance somehow? For instance, whether I can use Loader to load nodelet and return nodelet instance at same time?

I do this because nodelet subscribes a topic and I want to access the variable of the instance directly instead of re-pub a new topic.

Thanks a lot.