Hi @mamillerpa!
We don't currently support directly exporting this from QIIME 2 at the moment (please see this thread for more discussion around that topic).
@jairideout wrote up a nice little post on manually adding metadata to your feature table, if you haven't had a chance to peek at that, I would recommend starting there!
We don't have a phyloseq plugin (yet?), but if you haven't had a chance to play with q2-gneiss yet, I highly recommend it!
Let us know how it goes! 