Node-red-contrib-sma-webconnect custom values reading

Hello,
Does someone can explain me how to send an input payload to the sma-webconnect node?
I'm able to connect to my Sunny boy 3.0 but the only parameter I can retrieve is the output power. This is normal because Tripower is selected device. I figured out what are the identifier I want to get.
But I'm still stuck with the sma_config.

node-red-contrib-sma-webconnect/README.md at master · rlindner/node-red-contrib-sma-webconnect · GitHub