Then I wanted to use TOP HDA Processor to apply PivotPainter to all FBX models in folder. Documentation says "Buttons are converted into toggles within the HDA Parameters tab. When a toggle is on, it means that the HDA Processor will press the button before cooking." but unfortunately button is not pressed.
Since Unreal PivotPainter's button using Python callback script, I also tried to create additional button param that just runs Python script
print("Test")