how to feed expressions from a table

I have a table with a cell = ch(“…/panelw”)

I want an op’s panelw parameter to basically end up with the same expression that’s in that cell, but if I set its field to tab(“mytable”,0,0) the result is 0.

Is there a way to tell the parm to read its expression from a table?

this applies to other cases as well.

tx
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Does eval(tab("mytable",0,0)) work?