Customize allocation ✅ checkmark in calendar

Hi!
When I create a task through [ctrl]+[space] e.g. example test at 12:28, I get

this at my calendar (I still use Notion calendar to plan my events). See the little square? It is a Routine task.

Now, if I complete the task through Routine, the calendar event remains with that square. But it has been done! Can you please provide a way to change it to a green checkmark ✅ to easily see it as «done»?

I can change the event title to ✅ example test like this

but when I return to Routine

the done task has changed its name 😭 and a double checkmark is shown.

Thanks for reading.
Hope you can add this feature.

Best regards.