Show dashes in time field in panel by default

Is there a way to show dashes in a time field in the panel by default like it works for a date field ? :

β€” - β€” - β€”

dateStart:
  label: Date
  type: date

Now a time field in the panel is always filled by default with:

00:00

timeStart:
  label: Time
  type: time  

Thanks for any tip !

Doesn’t look like it but it seems it is not even possible to store 00:00. Let me check if there is an issue.

I created one: