This feature request has been declined by the feature team. However, the feature team is working on design changes to better help differentiate Teams files.
Which hopefully will help alleviate the confusion users are experiencing when when trying to identify SharePoint files versus Teams files.
Please consider finding a way for new Teams channels to integrate with an existing file structure in Sharepoint, not differentiate from it. Would be nice if we could direct the location of a file folder for a new channel (when we create the channel) and can put it in a logical place in our existing Sharepoint Structure. If you separate the Teams files from the other Sharepoint files, then you won't be able to use Sharepoint to easily find files/folders...only Teams.