flutter_webview_plugin not support http proxy or socks proxy?

# 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);