Flutter 如何在抖动中将PNG图像转换为WebP

我需要得到的图像使用图像拾取器插件，我需要转换这些图像为WebP使用Flutter 翼，图像拾取器已完成，现在我需要转换图像为WebP，以减少图像大小

this is my code to get the image ,also i added allowCompression: true to reduce the size but ,it doesnt convert the image to webp


Future<void> _pickImages() async {
      List<File> resultList = [];
      try {
        FilePickerResult? result = await FilePicker.platform.pickFiles(
          allowCompression: true,
          type: FileType.custom,
          allowMultiple: true,
          allowedExtensions: ['jpg', 'png', 'jpeg'],
        );

        if (result != null) {
          resultList = result.paths.map((path) => File(path!)).toList();
        } else {
          // User canceled the picker
          return;
        }
      } catch (e) {
        print(e.toString());
        return;
      }

      if (!mounted) return;

      // setState(() {
      for (var i = 0; i < resultList.length; i++) {
        bool isComply = await CommonMethods.isImageHorizontal(resultList[i]);
        // Check if the image is horizontal
        if (isComply) {
          if (!selectedImages.contains(resultList[i].path)) {
            selectedImages.add(resultList[i].path);
          } else {
            Logger().wtf("File Already Exist");
          }
        } else {
          // Show an error for non-horizontal images
        }
      }
      // });
      setState(() {});
    }