Node-red-contrib-growatt, remote configuration + problem access data

@looking4cache, Your node works very well, thank you. My question is:
Is it possible to inject the configuration data? If yes, how does the data structure look like?

Also I have a problem accessing the data the node produces.
If I copy the path to the data of the message, I get something like this:

let x = msg.payload["911763"].plantName);

That doesn't produce any value. Probably because of the ["911763"] in the message construct line.
How can I solve this?