Solved
Any conditional function in expression field ?
Am I able to get any conditional function to this expression field ?

Am I able to get any conditional function to this expression field ?

Yes. What kind of functions are you interested in using there?
This works:
if (inputParam =="aaa") result=2;
else result=4;
There are some limitations related to the objects and functions you can use in an expression. If it's useful, look here.
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