🎯 Creates one new artboard per object
📏 Fits the artboard exactly to each object's bounds

if (app.documents.length > 0) {
var doc = app.activeDocument;

    if (doc.selection.length > 0) {
        var sel = doc.selection;
        for (var i = 0; i < sel.length; i++) {
            var item = sel[i];
            var bounds = item.geometricBounds; // [x1, y1, x2, y2]
            doc.artboards.add(bounds);
        }
        alert("Artboards created for each selected object.");
    } else {
        alert("Please select at least one object.");
    }
} else {
    alert("No open documents.");
}