[QUESTION] Accessing Metadata As Buffer Rather Than Saving

I was wondering if there was a method to access the adjusted metadata as a byte array? For example, I understand the workflow to be:

- load file either from buffer, file path, or APP1 segment
- adjust metadata
- save the adjusted metadata to a file on disk

Since it is possible to load the file from a buffer, is there a way to access the adjusted metadata as a buffer?