Equivalent of Navigator Arguments in Flutter Go Router

What will be equivalent of the below Flutter Navigator in terms of Go Router?

    Navigator.pushNamed(
       context,
       Routes.CHANNEL_PAGE,
       arguments:ChannelPageArgs(
         channel:channel,
          initialMessage:message,
        ),
    );

Usually Go Router is based on parameters from the path. But the above example is based on a object instead of primitive parameters.

        GoRoute(
          path: '/profile/:id',
          builder: (context, state) => ProfilePage(id: state.params['id']!),
        ),

you can pass object as an extra like this:

final args = ChannelPageArgs(
     channel:channel,
      initialMessage:message,
    )
context.pushNamed('profile', extra: args)

in your goRouter:

      GoRoute(
              path: 'profile',
              name: 'profile',
              pageBuilder: (context, state) {
                final args = state.extra as ChannelPageArgs;
                return MaterialPage(
                  key: state.pageKey,
                  child: ProfilePage(
                    args: args,
                  ),