如何更改Vue js Bootstrap模式窗口的模式标题的名称？

<template>
  <div>
    <button @click="openModal">打开模态窗口</button>

    <div class="modal" tabindex="-1" ref="modalElement">
      <div class="modal-dialog">
        <div class="modal-content">
          <div class="modal-header">
            <h5 class="modal-title">模态窗口标题</h5>
          </div>
          <div class="modal-body">
            <p>模态窗口内容</p>
          </div>
          <div class="modal-footer">
            <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">关闭</button>
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { Modal } from 'bootstrap';

export default {
  mounted() {
    modalInstance = new Modal(this.$refs.modalElement);
  },
  methods: {
    openModal() {
      modalInstance.show();
    },
    changeModalTitle() {
      const modalTitle = document.querySelector('.modal-title');
      modalTitle.innerHTML = '新的模态窗口标题';
    }
  }
};
</script>