Relying to myself rather than replying to three people: this would be a good question on the RFC, but I would imagine that this would be possible, just not super useful. Usually inline asm is useful for doing stuff you cannot do in the higher level language, but wasm doesn’t have anything like that currently. I would imagine that it would be a fairly straightforward extension though.

They are probably asking why WASM (probably in .wat format) is not an option alongside x86/x86-64, ARM, AArch64, and RISC-V.

Perhaps why there is no wasm equivalent directive? Just a guess.