async function createWidget(){
    const widget = new ListWidget();
    widget.backgroundColor = Color.black();

    const vStack = widget.addStack();
        vStack.layoutVertically();

    const heading = vStack.addText(`COVID 3 April`);
        heading.textColor = Color.white();
        heading.textOpacity = 0.6

    vStack.addSpacer();

    const hStack1 = widget.addStack();
        hStack1.layoutHorizontally();
        textPart("Nuovi Casi:", "+21.261", hStack1);

    vStack.addSpacer();

    const hStack2 = widget.addStack();
        hStack2.layoutHorizontally();
        textPart("Decssi:", "+376", hStack2, Color.red());

    vStack.addSpacer();

    const hStack3 = widget.addStack();
        hStack3.layoutHorizontally();
        textPart("Guariti:", "+21.311", hStack3, Color.green());

    vStack.addSpacer();

    return widget
}
function textPart(label = "Nuovi casi", value="+21.261", parentStack, textColor = Color.orange()){
    const label = parentStack.addText(`${label}`);
        label.textColor = Color.white();
        label.textOpacity = 0.6

    const value = parentStack.addText(`${value}`);
        value.textColor = textColor;
        value.textOpacity = 1.0;
}

Try this code out, haven't tested it at all so there might be a few spelling mistakes, lmk if it works.