Unfortunately we don't currently support that. But the good thing is that we are planning to support that in near future. The support is planned to land in 1.2.0, see https://github.com/kontena/kontena/issues/1803.
So in nutshell, you'd be able to specify the volumes as top level elements in the kontena.yml and Kontena then manages those for you. To have the volume itself to replicate data between nodes then of course depends on the volume driver used.
In the first iterations on this I don't think we'll ship any plugins bundled with the platform. The problem is that all the plugins require different installation methods and Docker does not handle too well cases where the plugins are running as containers. Docker 1.13 is supposed to fix some of the issues, haven't yet verified if it really does. And Kontena has to support also older versions of Docker, so it might be bit problematic to have "bundled" plugins with Kontena.