如何在flutter web的HtmlElementView中执行iframe函数

dependencies:
  flutter_webview_plugin: ^0.3.11

import 'package:flutter/material.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';

class MyWebView extends StatefulWidget {
  @override
  _MyWebViewState createState() => _MyWebViewState();
}

class _MyWebViewState extends State<MyWebView> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('WebView'),
        ),
        body: Center(
          child: Container(
            child: WebView(
              initialUrl: 'https://example.com', // 通过iframe加载的网页链接
              javascriptMode: JavascriptMode.unrestricted,
            ),
          ),
        ),
      ),
    );
  }
}

class MyHtmlElementView extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return HtmlElementView(
      viewType: 'webview-html-element-view',
    );
  }
}

void main() {
  // ...
  runApp(
    MaterialApp(
      home: Scaffold(
        body: Column(
          children: [
            Expanded(
              child: MyWebView(),
            ),
            Expanded(
              child: MyHtmlElementView(),
            ),
          ],
        ),
      ),
    ),
  );
  // ...
}