At present, there is not an official way. However, we're in the process of reworking our builder and workflow infrastructure to more effectively allow people to run calculations according to our preset parameters and contribute them. The atomate package (https://pythonhosted.org/atomate/), which is essentially a repository of workflows that are used to generate all of the data we have (bandstructure, elastic tensor, piezo, etc.) with our preset parameters is one part of this that's more or less ready to go, but we're still in the process of updating the builder infrastructure such that we can seamlessly accept external results.
Also, a new system of user contributions (tentatively called MPContribs) in which users might contribute data that wasn't explicitly run using our methods (or comes from experiment) but can be attached to our data framework is in development.
We're devoting a significant portion of our resources to getting this done over the course of the summer, so feel free to check back in around a month or two. I'll make a note in my calendar to revisit this thread with an update in mid-July, for anyone else who's interested.