How to extract a value after splitting a JSON String in Node-RED

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I am injecting a String into my flow, then making it into a JSON String with the JSON node and splitting it with the split node. I get 5 messages out of this split node because there are 5 values with 5 properties. What I need is to extract only one of the values, to then use it in a function node. How can I do this?

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This is a picture of one of the 5 outputs. What I want is to ONLY use the value (137) in a function node that should come after the split node. Thanks in advance.