Add layoutWindows[0].properties to document.properties by script

I would like to set different properties by script, like rulerOrigin, zoomPercentage and so on.
The properties I want to set are in different positions in the object model. 

If I set them individually for each node in the object model (does this make sense?), it works as expected:

var doc = app.documents[0];

doc.viewPreferences.properties = {
    rulerOrigin: RulerOrigin.PAGE_ORIGIN,
}

doc.layoutWindows[0].properties = {
    zoomPercentage: 100,
}

However, it would be more elegant, do put everything in doc.properties like so:

doc.properties = {
    viewPreferences: {
        rulerOrigin: RulerOrigin.PAGE_ORIGIN,
    }
}

Unfortunately, I can’t figure out, how to add doc.layoutWindows[0].

The following code doesn’t work: 

doc.properties = {
    viewPreferences: {
        showFrameEdges: true,
    },
    layoutWindows.item(0): {
        zoomPercentage: 100,
    }
}

Any idea, how this is done?

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By the way: I’m not sure what layoutWindows[0] actually refers to. 
I guess it is meant to distinguish between multiple views of the same document. Am I right here?

Regards, Martin