Downloading and decrypting encrypted file / transformation rules

I am wondering if it's possible to decrypt encrypted file during download with this package?

Perhaps there is some way to provide the transformation function for the stream that's being downloaded?

In our case file is on the remote server available via HTTPS via link: http://example.com/encrypted_file.mp4 encrypted using some protocol. We would like to decrypt it during download and save decrypted on the phone locally.

Possibly related: https://github.com/fluttercommunity/flutter_downloader/issues/128