This currently isn't an option with a plugin. Can we expect this in the future?
Yes, we are working on the support for ArcGIS Online Enterprise login and ArcGIS Enterprise on-premises. Please expect it in the future releases.
This is now implemented in the 1.1 release.
Here is the Whats New for 1.1 https://community.esri.com/groups/arcgis-maps-for-adobe-creative-cloud/blog/2017/10/31/arcgis-maps-f...