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 also would like ability to add a Tab in Team that connects to Legacy SharePoint List.
Useful for a small Team to have access to a specific List on SP. Already have broken permissions on the legacy SP and granted Read permission to the O365 group of the Team. Just cannot get a List connector. Has Library and Documents but not granular to List only.