Scripting appearance, 2 fills, second with offset path

Hi,

it's possible to script, appearance, 2 fills, second with offset path ?

Already played with LiveEffect, without success 

var string = '<LiveEffect name="Adobe Offset Path">' +
'<Dict data="I jntp 0 R mlim 4 R ofst 0.283"/>' +
'</LiveEffect>';
app.selection[0].applyEffect(string);

Action do not record offset path