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For those looking still for a answer on this. You need to do it by the use of scripts. In my case I have created one to use inside SketchUp Ruby Command. Here it is what I use:

require 'openstudio'

# Read the open model
model_interface = OpenStudio::Plugin.model_manager.model_interface
model = model_interface.openstudio_model

ground_temperatures = [10.0] * 12  # 12 months, all at 10ÂșC (change it for your input)
site_ground_temp = OpenStudio::Model::SiteGroundTemperatureBuildingSurface.new(model)
site_ground_temp.setAllMonthlyTemperatures(ground_temperatures)

Applying it you will see the following on energyplus default report: image description

On the other hand I recommend you having a look at CFactor and FFactor boundary conditions. They can be more precise methods for ground surfaces in contact.

Hope it helps :)