How to slide something up from bottom

Was wondering if someone could help me implement some functionality. I’ve had a look at docs and can’t see if there’s a way to do it.

On button click, I’d like to slide a previously hidden panel up from the bottom so it takes up about one fifth of the screen at the bottom.

I’d then like it be possible for users to drag that panel up to a maximum of three fifths of the screen to see more of the panel. Similarly, they should then be able to slide it back down to one fifth of the screen. How could I do this?

You ever figure this out? I’m trying to figure out how to do the same thing. Similar to a ActionSheet, but with content instead of buttons.