"get in widget"?? How can I get a value out of a browser widget into LiveCode?

[Ben Rubinstein via use-livecode]

Thanks to this list, I know about "do in widget" that can cause some 
javascript to be evaluated in the current page in the browser widget. Which is 
great.

But how do I get (into LiveCode) the result of a javascript expression?
TIA,

Ben

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