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Open the .osm file with a text editor
CTRL-F "VariableRefrigerantFlow" ... should point you to the OpenStudio VRF object(s)
Take note of the class, e.g. CoilCoolingDXVariableRefrigerantFlow
Look up the class in the SDK object index (CTRL-F "VariableRefrigerantFlow" will yield 8 objects)
Whatever VRF attribute can be edited via OpenStudio (e.g. performance curves) would be listed.
As not all OpenStudio VRF object definitions hold COP, search in the generated IDF (and cross-reference)