This feature request is working its way through the backlog queue. No new details are available yet.
I tried to do this exercise yesterday and when I discovered that I can only link the root of a SharePoint site to the Teams. I thought I just delete the Teams team. In doing so my owner/admin i.e. me. was removed from the SharePoint site and I and my staff lost access to that SharePoint site with all our client data.
Owner of the site can be re-assigned in exchange. But this type of issue is a risk factor and surely must be fixed?