How to fetch Delivery Date into Sales Invoice?

[hktri]

We need the delivery date in the Sales Invoice. It is necessary by tax law. Normally it should be positioned für each item (position). I have found the Delivery Note, but I could't find the Delivery Date in the item field selection.

Is it planned to put the delivery date also into the template? Or how can I fetch the delivery date from the delivery note using jinja? Is there already a solution?