numberOpenOpTasks at TASK level

At PROJ object there is a field totalOpTaskCount a TASK has a collection openOpTasks and a matching field numberOpenOpTasks Task has collection opTasks

There is currently no way to get the count of all opTasks on a TASK. This is useful in a VIew or Report where I want to show tasks with, e.g. "5 total issues, 3 open"