How to share Office 365 without using the same onedrive account

So I have a Office 365 subscription and I would like to share this with someone in the household.

Obviously, If I were to just sign into my own account, it would share all my stuff on my onedrive so I'd like to avoid that.

On the desktop it's easy - sign in, download & install, then sign out.

How do I do this on the iPad though. Someone said, I can choose other people's onedrive account and assign the license to them. That person would even get the same 20GB extra storage. But I cant seem to find out how.

BTW I must say it's really confusing and stupid the way I have to go back and fourth between the websites for onedrive, outlook and officeonline. Why cant there be one central place to manage everything?