How to change Label Value in Vue with Element

I am using Element (https://element.eleme.io/#/en-US/component/select) to design my Admin Panel.

I have a Select. Now I want to select an option. With that The header of the Table Title will be changed. How is this possible?

Another problem is I want to placeholder the first element of the Select-Option.

Code:

Select Part:

<el-select v-model="value" placeholder="Select">
  <el-option
  v-for="item in options"
  :key="item.value"
  :label="item.label"
  :value="item.value"
  />
</el-select>

Table:

<el-table>
   <el-table-column label="value" width="120px" align="center" />
</el-table>

I want to make dynamic this label

JS:

data() {
    return {
      options: [{
        value: 'billingCountry',
        label: 'Billing Country'
      }, {
        value: 'billingState',
        label: 'Billing State'
      }, {
        value: 'billingCity',
        label: 'Billing City'
      }, {
        value: 'billingZIP',
        label: 'Billing ZIP'
      }, {
        value: 'shippingCountry',
        label: 'Shipping Country'
      }],
      value: ''
  }
}