I get what you mean now.
I don't think you can.
Your zone stamp doesn't actually draw the zone itself.
You can request information from it but can't alter its properties.
You can certainly draw a fill as part of your zone stamp that will cover the zone but I am not sure how you would get the co-ordinates of the zone perimeter.
You might need an add-on to get that info.
Barry.
One of the forum moderators.
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