TPS Character float on surface of water (from his chest)

Hay guys,i have been exploring the Ocean Water Shader from GitHub - UE4-OceanProject/OceanProject: Environment Plugin Project (Ocean Simulation, Sky Simulation, Buoyancy, Time, Fish plugins for Unreal Engine 4)
Is there a way to make the character float on surface of water starting from his chest instead of his foot.Thank’s guys,