Flutter – How to add fixed width to a chip widget?

I need to give fixed width for the chip widget like this image , but width is changing based on label text

return SizedBox(
        width: MediaQuery.of(context).size.width * 0.4,
        child: ChoiceChip(
             side: BorderSide(color: Color.fromARGB(255, 10, 60, 100)),
            backgroundColor: Colors.transparent,
            selectedColor: Color.fromARGB(255, 10, 60, 100),
            label: Text(
              'Free Wifi',
              style: isChecked ? _filterButtonTextStyle : _g4LabelNormal,
              maxLines: 2,
            ),
            selected: isChecked,
            avatar: SvgPicture.asset(
                'assets/images/wifi.svg',
                width: _filterAmenityIcon,
                height: _filterAmenityIcon,
                color: isChecked ? _whiteColor : _filterAmenityColor),
            onSelected: (value) {
            }));