Custom Calculation Formula: Join two lists into one string - OpenLab CDS 2.7

Hey guys,

I'm currently experimenting with the join() function. I want to combine two lists into one, which is possible as far as i know in LINQ.

My best shot working with join is: 

string.Join("; ",
Select(function(item) item.GetDoubleCC("PU_single")).

with "PU_single" beeing results as double

I want to combine those results with the individual peak_name by combining those lists according to their peak_number

Is this even possible in OL and if so, can someone help me pls?

Thanks and greetings :-)

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