I need help whit member login bar

Currently, I need to add a value and manage it in the following way:
$w("#dropdown7").options = [
{ label: "Cancelar servicio", value: "Cancelar servicio" },
{ label: "200", value: "200" },
{ label: "500", value: "500" },
{ label: "3.000", value: "3.000" },
{ label: "10.000", value: "10.000" }
];
Using Velo.
However, the Member Login Bar does not allow managing values in this way. Is there any alternative or a way to configure these values dynamically?