Percentage of a task completed or tasks count

For tasks that have subtasks, instead of seing the number of subtasks under the main tasks, it would be nice to see a task count or percentage. For example for a task that has 4 subtasks, if I completed 2 subtasks, I’d like to see under the main task 2/4 or 50% and once the last subtask is completed, the main task should automatically be completed.