Send ONE automated email for multiple items with same due date

Hi all!
I have a board where several items have the same due date. I have set up an automation to email someone outside of 7 days before the due date. However, the recipient is receiving multiple emails on the same day (one per item).

I can’t figure out how to consolidate all items with the same due date into one reminder email.

One other complication is that I will need to do this on up to 30 boards, but not every board has the same items grouped together.

Thanks for any help you can provide!