I can tell that "Tasks" has integration with Outlook Win32 desktop program, Windows 10 UWP Mail/Calendar apps as well as this weird Wunderlist make over To-Do UWP app (which is strangely not integrated with Windows 10 UWP Mail/Calendar apps, just as how tasks is integrated with the Outlook Win32 desktop prorgam). I can see that there is a Microsoft Graph documentation for accessing Planner in Office365, but I cannot see the same documentation about "Tasks":
https://developer.microsoft.com/en-us/graph/docs/api-reference/v1.0/resources/planner_overview
How can I access/create/update/delete tasks in "Tasks", through Microsoft Graph?