these are already done or boring (colors comment tags both emacs and nvim do), depend on language spec (images in comments would really depend on the lang spec)

these are already done or boring (colors comment tags both emacs and nvim do), depend on language spec (images in comments would really depend on the lang spec), depend on language runtime spec and debug info (searching through memory for some struct, replay), or just see lame or do not apply to most languages (commit mask - this might be partially doable at the git level).