MQTT subscribe

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Hi There,
I am currently trying to write a single Value from a JSON Payload to an Object.

I tested JSON Parse to Lua Table by adding the Payload from my MQTT Browser to the Script and decode it. Works just fine. MQTT Payload to Objects works as well.
But my JSON is too large for a String Object. But I struggle to add the MQTT Payload to a Variable.

Does Anyone have any Ideas or experience with this?

Thanks