Way to force trigger Quest controller via script ? (Like squeeze fist with only one button)

Hi,

I just want to know if there is a way to force the controller or the hand's rigg to squeeze the fist only by pressing one button via script ?
I want to change the state of the hand only by pressing one button, and if it's possible without using custom hands.

For example, I want to press the IndexTrigger from the right hand and squeeze the fist with all finger on hand's rigg.

Is there a way ?


Thanks !