While I can introduce web_socket_channel into dart, iOS won't be able to call this package

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While I can introduce web_socket_channel into dart, iOS won't be able to call this package.
I checked and found that web_socket_channel is not imported into the iOS project by cocoapod.
But I can import some other packages into the iOS project.

Flutter 3.19.0 • channel stable • https://github.com/flutter/flutter.git
Framework • revision bae5e49bc2 • 2024-02-13 17:46:18 -0800
Engine • revision 04817c99c9
Tools • Dart 3.3.0 • DevTools 2.31.1

Xcode 15.2