Extract Value from list of records if ID matches

[zebra]

Hi All,

Could you please help me out from the following situation?

Lets suppose I have data with two columns. The first column contains the ID and second column contains the list as follows

In the list, there can be multiple or no json records as follows

If I click any of the above record, then I get following json as follows

If I click on the third row lets say its key is mykey, then It is also a record and may contains the same ID that was in the first ID column as follows

 Here I want to get the value of unit for that particular record in which mykey id matches with the id in the first column, if it did not match then just return the null.

Could anyone let me know how I can make a custom column to have unit value where first column ID matches with the ID in the list of records?

Thanks

[lbendlin]

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