Customizing the files view has been announced and is coming soon! This will include viewing metadata from document libraries and lists.
Here is the link to the blog post that details the features that are coming: https://techcommunity.microsoft.com/t5/microsoft-sharepoint-blog/rich-new-file-and-sharing-experiences-throughout-microsoft-365/ba-p/960129
An error occurred while saving the commentNina Torjesen commented
We need to edit document metadata under the "file" tab in Teams.
I apologize for not having updated this. Changing the landing page for a Team and/or Channel remains on the backlog at this time.