Add pinch zoom to timeline in Davinci Resolve


I would like to use BTT to add trackpad pinch zoom to the timeline in Davinci Resolve.

If I assign a keystroke (zoom in/zoom out) to the gesture, it will only zoom one step for each gesture. Instead I would like to assign the Resolve default trackpad gesture [opt + two finger up/down] to the pinch gesture. But as far as I can see, there is no way to choose a gesture as an action. Is there another way to make this work?

Best, Markus