Linking Teams to a Communication site?

When you create a new Teams channel, by default it will deploy a linked team site in SharePoint for the files to be stored in. However, we need to create a Teams channel that links to a communication site, not a team site.

I know you can add an extra tab in Teams and link any document library from any site, but this is not what we want. We need the actual 'files' tab in Teams to be directly linked to a communication site. However, when creating a Teams channel there is no option to choose a comms site, it just defaults to a team site.

Is there any way I can do this?