ListView Json and save Switch IsToggled

I would like to save the data of this switch from a list of json and save the change of the switch for the following contentPage

<ListView.ItemTemplate>


<ViewCell.View>





</ViewCell.View>


</ListView.ItemTemplate>

public async void LlenarListaEstado()
{
try
{
ListEstado manager = new ListEstado();

            var res = await manager.getEstados();

            if (res != null)
            {
                ListaIncidencias.ItemsSource = res;
            }
        }
        catch (Exception ex)
        {
            await DisplayAlert("Error", ex.Message, "Aceptar");
            return;
        }
    }