Display subtask counts and completion progress in the task list

I'd like to suggest an option to display subtask counts and completion progress directly in Griply's task list, without having to open individual tasks.

Currently, tasks with subtasks have a three-line indicator next to their name. It would be useful to extend this functionality in the following ways:

Optional progress display: Add a "Show subtask progress" toggle in the task list's display settings, directly below the existing "Show completed tasks" toggle.
Display completion progress: When enabled, show the number of completed subtasks relative to the total number next to the existing three-line indicator. For example, "2/5" would indicate that two of five subtasks have been completed.
Hover tooltip: When hovering over the three-line indicator, display a tooltip showing the same information in a more descriptive format, such as "2 of 5 subtasks completed". Ideally, the tooltip should remain available even when the progress display is disabled.
Tasks without subtasks: Continue to leave the indicator area blank for tasks without subtasks.

The progress count should include all subtasks, including completed ones, regardless of whether completed tasks are currently visible in the task list.

This would make it easier to see both the number of subtasks and their completion status at a glance, while allowing users to choose whether that information is always visible or available only on hover.