Katalon Recorder - Test a Calculation based on variables


I would like to know if it’s possible with Katalon Recorder to check the result of a calculation of two variables.
My application do a calculation on 2 amounts that I saved in both variables via the command store.
Then I would like to create a new variable based on the addition of the both previous variables stored and checked the value with value displayed:

Perhaps I need to use javascript script for the calculation but I don’t know how to implement it.
Could you help me please do do that?

Thanks in advance for your help

I solved the issue by replacing store by storeEval:

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