outlook.com calendar – Outlook 365: Is it possible to show Planner tasks in To Do tab?

I enjoy the To Do section to the right of the calendar, and particularly the possibility to drag and drop tasks into the calendar. It seems however, that not all lists that are available in the To Do app are shown in this section. I miss in particular the “Planned” ones (i.e. retrieved from tasks assigned to me on Planner), which are nearly all in my case.

Lists in app (“Webinars” end everything below it are already my custom lists):

Lists seen in To Do app

Lists in calendar section:

Lists seen in To Do section

Is this something that somehow has to be configured? Or is it a missing feature? Or is there a reason not to expect this to be available?

I haven’t been able to find anything similar to this on the internet.