Looking for theme type



I’m wondering if there’s an existing theme out there that fits my needs. What I’m looking for is the ability to create inline annotations on a static, multi-page document. Think something similar to the commenting feature in MS Word (except static, not user-driven). You should be able to click on some underlined or annotated portion of a text, and hopefully get a comment or annotation on the sidebar (rather than sending you to a footnote where you have to navigate back). So far I haven’t found a theme that does this. Thanks!