I made another PoC for this: https://anvil.works/build#clone:ZA7ENWHOVT7D7CQ3=6RUAT5ZZEQ3CEF6UFIP2BQ6B
I also did this based on some forum suggestions, but made it so that you can have the infinite scroll apply to an item contained inside another component and specify a height for it. Same as @david.wylie did though, using a custom HTML component and custom events.