As it happens, the @ notation is used by several code documentation "generators". A somewhat popular one is Doxygen. You might want to look at its notations for the purpose of making your usage compatable.

Also, as I recently discovered, the Perl6 project has extended POD syntax to include similar comments as code annotations, using #| or #= to introduce these annotations. However, the markup in these comments is "just" more POD. However, it validates the concept you are proposing.

There is a module that partially implements Perl6 POD syntax, but it appears to not implement #| and #= comments. If this is the case, I am considering enhancing it.

FWIW, I am working on a Doxygen to POD filter. An early version is Convert Doxygen to POD.

Update: Fixed a grammar error.

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