Is it possible to change "Layer Styles" properties such as "Color Overlay" in script ?

I have almost the same problem, but the answer has not been given here. I'd like to be able to read the gradient overlay values, I mean this (see picture below)

I need to gather those 4 gradient points values. Is that possible?

#target aftereffects

{

     var theComp = app.project.activeItem;

     var theLayer = theComp.selectedLayers[0];

     alert(theLayer.layerStyle.gradientOverlay.colors);
}

This exists, but I don't know which one the next step would be. I need to get inside colors, but "value" gives me an error.

Yes it is possible

shapeLayer = pipComp.layers.addShape(); // adding a shape layer to the pipComp
shapeLayer.selected= true;
        app.executeCommand(9006); // add Fill Color
        var shapeColor = shapeLayer.property("ADBE Layer Styles").property("solidFill/enabled");
        shapeColor.canSetEnabled;
        shapeColor.property("solidFill/color").setValue([1,1,1,1]);

"Layer Styles" blend modes are read only. This was using the Stroke Layer Style.

app.project.item(1).layer("Layer Name").property("ADBE Layer Styles").property("frameFX/enabled").property("frameFX/mode2").value

You can read or write a comp layer blend mode though via:

Pg. 42 of Adobe CS3 After Effects Scripting Guide AVLayer blendingMode attribute app.project.item(index).layer(index).blendingMode Description: The blending mode of the layer. Type: A BlendingMode enumerated value; read/write. One of: BlendingMode.ADD BlendingMode.ALPHA_ADD BlendingMode.CLASSIC_COLOR_BURN BlendingMode.CLASSIC_COLOR_DODGE BlendingMode.CLASSIC_DIFFERENCE BlendingMode.COLOR BlendingMode.COLOR_BURN BlendingMode.COLOR_DODGE BlendingMode.DANCING_DISSOLVE BlendingMode.DARKEN BlendingMode.DARKER_COLOR BlendingMode.DIFFERENCE BlendingMode.DISSOLVE BlendingMode.EXCLUSION BlendingMode.HARD_LIGHT BlendingMode.HARD_MIX BlendingMode.HUE BlendingMode.LIGHTEN BlendingMode.LIGHTER_COLOR BlendingMode.LINEAR_BURN BlendingMode.LINEAR_DODGE BlendingMode.LINEAR_LIGHT BlendingMode.LUMINESCENT_PREMUL BlendingMode.LUMINOSITY BlendingMode.MULTIPLY BlendingMode.NORMAL BlendingMode.OVERLAY BlendingMode.PIN_LIGHT BlendingMode.SATURATION BlendingMode.SCREEN BlendingMode.SILHOUETE_ALPHA BlendingMode.SILHOUETTE_LUMA BlendingMode.SOFT_LIGHT BlendingMode.STENCIL_ALPHA BlendingMode.STENCIL_LUMA BlendingMode.VIVID_LIGHT