Not like now. Gitweb feed (RSS and Atom) shows only the history (log) of this branch (HEAD by default, i.e. Current branch). You can sort tags by name, using version sorting, or by tag date, but in fact the tag does not have a pointer to the previous tag, for example commit.
However, you have sources, so you can extend gitweb (and hopefully provide patches to the git mailing list, git @ vger.kernel.org).
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