ExtJS:如何使用单个记录将标签绑定到ViewModel商店

Ext.define('MyApp.view.MyView', {
    extend: 'Ext.panel.Panel',
    viewModel: 'myViewModel',
    // ...
});

Ext.define('MyApp.view.MyViewModel', {
    extend: 'Ext.app.ViewModel',
    alias: 'viewmodel.myViewModel',
    stores: {
        myStore: {
            model: 'MyApp.model.MyModel',
            data: [
                { id: 1, label: '标签1' },
                { id: 2, label: '标签2' },
                // ...
            ]
        }
    },
    formulas: {
        selectedLabel: {
            bind: '{myStore.selection.label}',
            get: function (label) {
                return label;
            },
            set: function (label) {
                // 处理标签变更的逻辑
            }
        }
    }
});

Ext.define('MyApp.view.MyView', {
    extend: 'Ext.panel.Panel',
    viewModel: 'myViewModel',
    items: [{
        xtype: 'label',
        bind: '{selectedLabel}'
    }]
    // ...
});