For the SoLoud plugin I ported the library author’s examples and almost all of those involved an audio histogram, which is the same sort of thing (update call further down). Assuming interaction means input, each bar could have its own touch listener.
Possibly relevant, on a lark last week I ported MoonNuklear to Solar (library was easy; backend still a WIP, but overview sample mostly works). (See also Nuklear itself, of course.) Right now it’s a bit slow, mainly due to A LOT of mesh updates, but there might be some internal improvements coming on that side of things in the near future.