How to get die width value

Hello everyone! I'm a newbie BricsCad developer from Japan. I'm finding a way to get value of "die width" value from a sheet metal drawing (with AutoLisp or C++).

I know that there was a series of Lisp commands (SmLispGet ... ) that allowed developer to get many values of sheet metal, but I couldn't find any useful command in this case.
Please give me an advise how to deal with this! Thank you for your attention.

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