I would like to add annotations to specific words for things like definitions or side notes that might not fit in the flow of text in an object. For example, I would like to be able to hover over an annotated word and have the annotation pop up similar to the popup that appears when you hover over a page. A potential use case would be for abbreviations or acronyms that might not be common for you and the annotation could serve as a reminder of what the abbreviation or acronym means.