The "from Hits" portion isn't supported. I don't believe there are any sources of bleeding that come from non-hits, so that could potentially be added in the same place as Damage over Time Multiplier for Bleeding

In bytecodealliance/wasmtime#2497 (comment) we added support for generating nested modules, and we generate these modules by concatenating strings of WAT and then passing it to Module::new which internally checks for WAT strings and assembles them into Wasm bytes if necessary.

We can make this more efficient, improving the number of test cases we fuzz in a