googleForms.updateItem replaces an item while preserving its ID, position, and question IDs where possible.
Example
Inputs
Provideform, a complete replacement item, and an immutable item ID or one-based position in itemReference. Item definitions match Add item. requiredRevisionId is optional.
Second argument { account } selects the Google Account binding.
Output
Returns the updatedForm. Because the update mask covers the whole item, it removes omitted fields.