Is it possible to find out full content height or scroll length of the list?

[thisisgit]

Hi I'm trying to implement auto-scrolling the list when dragged item has either reached start/end of visible part of the list.
Something like this one: https://youtu.be/p8U4uWhyIrY?t=181

I'm using scrollTo of reanimated just like in that video so that I can cancel scrolling when dragged back to center.
Scrolling to top is simple because it just needs to scroll to offset 0.
But scrolling to bottom is tricky because I need to know the scroll size which is equal to fullContentHeight - visibleAreaHeight.
When I measure FlashList's height using either measure() of reanimated or onLayout, they both return visibleAreaHeight.
I need to find fullContentHeight and can't just do itemCount * itemHeight since each item has dynamic height.

I can see scroll bar at the right side with right size so I assume full content height is being calculated inside?
Is there a way to find that value?

[thisisgit]

Found out that there's a prop that isn't mentioned in the doc: onContentSizeChange.
This returns width and height of the scrollable content view and is exactly what I was looking for for fullContentHeight.