I'd like to write software that attaches extra metadata to a .zst file by appending an empty file that stores information in metadata. If it was gzip, I could use "comment" section in header, but I couldn't find any hint in a documentation that such a field is present in .zst format. What else could I "abuse" for that purpose? Would dictionary data be a good fit? If yes, how can I craft an empty .zstd file that stores metadata in a compression dictionary?
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