How to chain extension in flutter

Question

I found out intersting way of reducing the work required for customizing widgets via extension

Ex: To make the text red i would make an extension like the following

Container(
  child: "Krishna".redText(),
)

extension TextTheme on String {
  redText() {
    return Text(
      this,
      style: const TextStyle(color: Colors.red),
    );
  }
}

I want to extend this further by using the chain method . But unfortunately I can't find much resources using this method .

Example to make the text further bold , I want to define bold()

extension Theme on Text {
  bold() {
    return Text(
      data!,
      style: const TextStyle(fontWeight: FontWeight.bold),
    );
  }
}

And use as "Krishna".redText().bold()

It gives me error

NoSuchMethodError: Class 'Text' has no instance method 'bold'.
Receiver : Instance of 'Text'
Tried calling : bold()

I am looking forward for a solution and more examples to achieve the same or good method of achieving this property using extension.