This item is still in the works.
Also, thank you for the additional feedback. I will circle back to the feature team and provide a new update soon.
I've added a few tabs linking to different SharePoint pages, they all belong in the same Teams SharePoint Online site. On Teams Desktop, none of the pages will load unless I load a tab linking to Home first. And I don't need to load Home of the existing group, even if I load Home from a different group, then the other pages will then load, but if I don't do this, I get nothing, no even an error. This is weird ...
This feature request is working its way through the backlog queue. No new details are available yet.