Can Binary GPG Files Store Custom Attributes?

In my current backup scheme, I TAR the files I want to back up with the data, time stamps, and permissions. But I want to reduce the number of I’m more interested in the timestamps since that tells me when I recorded a meeting, or took a picture. I know GPG stores the name and creation dates automatically if I use a command like gpg --symmetric file since gpg --list-packets < file.gpg shows the packets inside the resulting GPG file:

:symkey enc packet: version 4, cipher 7, s2k 3, hash 2
    salt 2731d25931f0118c, count 65536 (96)
gpg: AES encrypted data
:encrypted data packet:
    length: unknown
    mdc_method: 2
gpg: encrypted with 1 passphrase
:compressed packet: algo=1
:literal data packet:
    mode b (62), created 1468382400, name="file",
    raw data: 465055 bytes

But the created date specifies the creation date of the GPG file, not anything from the original file’s timestamps. It would be nice to be able to get custom fields added to a GPG file (encrypted, not as a comment). There are a lot of cloud backup solutions, and most of them mangle the file time stamps, which I need.

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