Read files with scsh3

Hi, I am using Smart Card Shell 3 to send APDU commands and encrypt data with a Nitrokey HSM 2. Everything works well, I am using theses commands

var plain = new ByteString ('0000000000000000', HEX);
var enc = sc.card.sendApdu(0x80, 0x78, key.getId(), 0x10, plain, [0x9000]);

But I would like to know if instead of typing the value of the plaintext that I want to encrypt, it exists another command that can read files. I saw the readBinary() function but it seems like it only read files from the smart card and not files stored on the computer.