How to use the httpie.utils.load_json_preserve_order function in httpie

if item.sep in SEP_GROUP_DATA_EMBED_ITEMS:
                try:
                    with open(os.path.expanduser(value), 'rb') as f:
                        value = f.read().decode('utf8')
                except IOError as e:
                    raise ParseError('"%s": %s' % (item.orig, e))
                except UnicodeDecodeError:
                    raise ParseError(
                        '"%s": cannot embed the content of "%s",'
                        ' not a UTF8 or ASCII-encoded text file'
                        % (item.orig, item.value)
                    )

            if item.sep in SEP_GROUP_RAW_JSON_ITEMS:
                try:
                    value = load_json_preserve_order(value)
                except ValueError as e:
                    raise ParseError('"%s": %s' % (item.orig, e))
            target = data

        else:
            raise TypeError(item)

        target.append((item.key, value))

    return RequestItems(headers_class(headers),
                        data_class(data),
                        files_class(files),
                        params_class(params))

def _load_json(self, item, contents):
        try:
            return load_json_preserve_order(contents)
        except ValueError as e:
            raise ParseError('"%s": %s' % (item.orig, e))

def load_json(arg: KeyValueArg, contents: str) -> JSONType:
    try:
        return load_json_preserve_order(contents)
    except ValueError as e:
        raise ParseError('"%s": %s' % (arg.orig, e))