Currently, there is ability to add multiple items in a worksheet main view:
When there are grid cards in Additional Insights, the insert multiple items option is not available:
The option to be able to add multiple list items without additional actions/processes is really helpful in addition to making the experience for the end user very seamless and uniform across different sections within a worksheet. Especially when the default view on a worksheet is split in two grids, the users expect the behavior to be the same on both reports.
Additionally, if this functionality was extended to any grid card whether it is board or worksheet, it would be even better!!