ql.FloatFloatSwap() fairSpread

Currently ql.FloatFloatSwap object has no attribute 'fairSpread' . Can expert here please help to add it? I might be wrong but it seems ORE does has this added. Thank you very much in advance.

https://github.com/OpenSourceRisk/Engine/blob/master/QuantExt/qle/instruments/tenorbasisswap.hpp