Sharing ownership to a Creative Cloud Express project?

Does anyone know if you're able to share ownership or transfer ownership of a Spark Adobe Creative Cloud Express project? We have a team that can access eachother's projects, but if a change is made to a project only the owner of the project can update the link. Is there a way around this, for example if the owner is out of office and can't update? Thanks

Moderator note: I updated your post to reflect that Adobe Spark is now Adobe Creative Cloud Express and that you can collaborate with others using the application. Hope that helps.