Hello.
Is there any way to add a new field into a task ?
You can use markdown syntax to create checkable tasks in the description field:
- [x] Task 1
- [ ] Task 2
- [ ] Task 3
A separate section in the UI for this kind of tasks is not planned.
There is an issue for user defined fields which also cover predefined checkboxes per card, not sure whether this really fits your needs, just as a hint.