Automatic assignment of external variable

[mirko.comparetti]

Hello,
I have a string variable that contains the name of an external variable. How can I use the value of that string to get the proper value from the external?

The pseudocode of what I'd like to do is here

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PROGRAM someProgram
	VAR
		someString : STRING[50];
		someWord : WORD;
	END_VAR
	VAR EXTERNAL
		someExternalA : WORD;
		someExternalB : WORD;
	END_VAR
	
	someString := 'someExternalA';
	
	someWord := SOMEGET(IN := someString); //GET THE VALUE OF someExternalA
	
	someString := 'someExternalB';
	
	someWord := SOMEGET(IN := someString); //GET THE VALUE OF someExternalB
END_PROGRAM

so basically I'd like to find a way to assign the proper value to

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someWord

based on the content of

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someString

using a method

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SOMEGET(IN := someString);

(or something similar).

Thanks