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Is it possible to control Point gravity through blueprint(or c++)?

Hi guys,
I have an issue with controlling particles during gameplay. I want to control it through a bluprint (or c++ ?) radius of my Point gravity, as you can see in the video ( https://www.youtube.com/watch?v=c-rZTiSnwXA&feature=youtu.be ). I read about setting up particle parameters ( https://wiki.unrealengine.com/Particle_Instance_Parameters_Tutorial ), but I can`t see this option on module point gravity. Any suggestions?