flutter_webview_plugin not support http proxy or socks proxy?

[Falways]

I want use proxy in flutter_webview_plugin, that not provide property to set proxy!

const WebviewScaffold({ Key key, this.appBar, @required this.url, this.headers, this.javascriptChannels, this.withJavascript, this.clearCache, this.clearCookies, this.mediaPlaybackRequiresUserGesture = true, this.enableAppScheme, this.userAgent, this.primary = true, this.persistentFooterButtons, this.bottomNavigationBar, this.withZoom, this.displayZoomControls, this.withLocalStorage, this.withLocalUrl, this.localUrlScope, this.withOverviewMode, this.useWideViewPort, this.scrollBar, this.supportMultipleWindows, this.appCacheEnabled, this.hidden = false, this.initialChild, this.allowFileURLs, this.resizeToAvoidBottomInset = false, this.invalidUrlRegex, this.geolocationEnabled, this.debuggingEnabled = false, this.ignoreSSLErrors = false, }) : super(key: key);

[wuxiaohaoios]

如何在webview 访问的时候设置socks 代理退出的时候关闭呢