in the browser you can compile modules and create instances from arrays of numbers/bytes, here's an obfuscated example: https://wasmgroundup.com/blog/wasm-compiler-in-a-tweet

if the host provides the guest wasm module via imports a function to create and run from an array of bytes then it can be done today (if I understand you correctly).

Here's some related content: https://github.com/pdubroy/til/blob/main/wasm/2024-02-22-Run...