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In my postprocessor the blockform for in machine simulation is given out by workpiece values.
Maybe you can use it!

{ // stock - workpiece
    var workpiece = getWorkpiece();
    var delta = Vector.diff(workpiece.upper, workpiece.lower);
    if (delta.isNonZero()) {
      writeBlock("BLK FORM 0.1 Z X" + xyzFormat.format(workpiece.lower.x) + " Y" + xyzFormat.format(workpiece.lower.y) + " Z" + xyzFormat.format(workpiece.lower.z));
      writeBlock("BLK FORM 0.2 X" + xyzFormat.format(workpiece.upper.x) + " Y" + xyzFormat.format(workpiece.upper.y) + " Z" + xyzFormat.format(workpiece.upper.z));
      writeComment("");
    }

 I think

var workpiece = getWorkpiece();
xyzFormat.format(workpiece.upper.z)

what you are looking for