Checboxgroup radioGroup 值缺少 valueKey. labelKey. 用于值和名称的获取

[LinboLen]

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To Reproduce
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1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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checkboxGroup 值 可以是这样

[
 {name: 'name1', value: 'value1', checked: false},
 {name: 'name2', value: 'value3', checked: false}
]

也可以这样, 当用到了 valueKey时, valueKey可以是字符串也可以是回调函数
[
'value1',
'value3',
]

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environments (please complete the following information):

• Browser [e.g. chrome 80, safari]
• component version [e.g. 8.0.0]
• angular framework version [e.g. 8.0.0]

Additional context
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[wangyaju]

@LinboLen 目前，对于对象形式的option，可以通过模板来实现lable的自定义显示，选中会把当前option都提供出来，方便处理