We have a add-in which inserts a custom function to the sheet. The custom formula response from our server contains the formula result along with metadata details like the cell styles, ranges, sheet name, number format. The result is parsed and rendered, applying the styles and formats accordingly. However, this process causes undo issues: two separate actions appear in the undo stack—one for applying styles and number formats, and another for adding the formula—with no current way to group them into a single undo step.