No, by design the opf is kept in a parsed state so that file splitting, merging, new files added, files removed, can done, etc. There is no structure in the opf parser that supports keeping free form comments as they could be placed anywhere.
If you really need to keep something stored in the opf, you could hide it as an additional dc:description metadata field or your own custom metadata. If so, do not forget to xml escape it.
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