I'm migrating a VSTO Excel add-in to JS and noticed a features that's not available yet.
In the VSTO model, we can create cell comments/notes that are intended as documentation, showing the user the purpose of a column within a spreadsheet. This differs from the philosophy of comments with Office JS - as a dialog between users.
The following comment from a sheet created by the VSTO add-in shows what I mean:
In JS
the comment 1) includes the user's name which is not relevant here
2) invites replies, which we don't want here.
(I've figured out how to mark a comment as resolved but it still does not look as nice.)
Also, in VSTO, we can add images to comments. This is very useful when communicating chemistry within an Excel sheet -- the chemical structure conveys lots information but can be obtrusive. In a comment, the structure appears when the user hovers over the cell.
This is a request to add these capabilities to Office JS.