UE4 - How to edit Post Process Color Scene or Grading through BP? imag att.

Hi, i want to add a post process color for different scenes with a BP, then i want to be able to customize its´s post process´s Color Scene or Grading LUT from BP details to be able to customize it… but i already tried to find “scene color” or “color grading” at the construction tab and i cant, there is only a “set post process color” node, no idea then how to add a variable to edit the color of scene or LUT from BP since i canot call it inside the BP.

Please Help