Flutter show Cancel-Button on CupertinoSearchTextField

I am using the CupertinoSearchTextField in my app. It is working fine so far but I am missing one feature: the Cancel-Button.

In native iOS you can set to show the button which looks like this:

Does Flutter provide this functionality? I couldn't find it anywhere.

Clarification:

I don't mean the x/clear-button. I know that is build-in. What I mean is the actual Cancel-button which removes focus from the textField.

I ended up building it myself. I made use of the Focus-Widget and most important the AnimatedPadding. My code looks like this:

  Row(
    children: [
      Flexible(
        child: AnimatedPadding(
          duration: const Duration(milliseconds: 100),
          padding: EdgeInsets.only(right: _isSearching ? 50 : 0),
          child: Focus(
            onFocusChange: (hasFocus) {
              setState(() {
                _isSearching = hasFocus;
              });
            },
            child: CupertinoSearchTextField(
              placeholder: 'Suche'.tr,
              controller: _textEditingController,
              focusNode: _focusNode,
            ),
          ),
        ),
      ),
      if (_isSearching)
        Tappable(onTap: () {
          dismissKeyboard();
        }, builder: (context, isTapped) {
          return AnimatedText(
            text: 'Abbrechen',
            isTapped: isTapped,
            style: AppTextStyles.avenirNextH4Regular,
            color: grey,
          );
        }),
    ],
  ),