From the maintainer Li Haoyi: I'm putting a 1000USD bounty on this issue, payable by bank transfer on a merged PR implementing this.

Mill's example test suite has examples for hello-world and todo-mvc projects using in Java using Spring-Boot and Micronaut built using Mill (https://github.com/com-lihaoyi/mill/tree/main/example/javalib/web). They're not super fleshed out, but they exist.

We should add similar hello-world/todo-mvc examples for the Quarkus web framework, which according to the IntelliJ dev survey is relatively popular (between Spring-Boot and Micronaut https://www.jetbrains.com/lp/devecosystem-2023/java/)