Writing KNX Sensordata to AWS Dynamo DB

I'm trying to write the ouput from my KNX sensor into a DynamoDB in the Amazon AWS cloud. I get the data as an ouput with the debug node. I'm pretty new to Node Red and JSON and I have no idea how to reference the message payload (Windspeed in my case) into the item field of the DynamoDB Node

Thanks for your help in advance.

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