Send alert for expired tickets

Hi.
I was wondering if there is a possibility to send several alerts for an expired ticket based on a rule.
As I understand it, the use of unit indicators is based on the due date of a ticket. However, I would like to send alerts / emails even after the due date has expired. For example, every 12 hours for the first 5 days, then once a day until the ticket is closed. Is there such a possibility?
If such a possibility does not exist, I would find it very interesting ...
Many thanks for all your constant and daily commitment to this huge wonderful project.

Wow! ... I've forgotten to see in this section. Really impressive!!!
Just a question: where can I find the list of allowed words? I've looked into the guide and found nothing. May you please help me with this list?
Many thanks

Many thanks!
One last question: helpers add words prepended by ${...} while inline help and manual refer to #{...}. Just to be double sure, is ${....} the correct choice?
Regards.