Can't vouch for it's effectiveness, but Hotwire Native might meet the needs for mobile paired with plain HTML. Despite the name, it doesn't seem that using Hotwire for the web UI is necessary to use Hotwire Native. I could be wrong about that though.

https://native.hotwired.dev/

Hotwire doesn't work anywhere you can't guarantee a high-quality low-latency connection. Every UI interaction in Hotwire includes that round trip.