This feature is now on the backlog. I will update you when we have more details to share.
Pinning the entire document library is supported today. Learn more here, https://support.microsoft.com/en-us/office/add-a-sharepoint-page-or-list-to-a-channel-in-teams-131edef1-455f-4c67-a8ce-efa2ebf25f0b.
We currently do not support pinning a specific folder, but we are considering this feature.
An error occurred while saving the commentAnonymous commented
We have a project archive with seperate project folder in sharepoint. In teams I would like to link specific subfolder of our sharepoint archiv to a specific team.