Not yet - I just created a browser-wasm project using the .NET CLI and then experimented with it. I spent a bunch of the digging through .targets files to see what optimization options were available.
I plan to put the source on GitHub shortly so others can use it as an example. Just need to clean things up a little first.
And exporting to WASM works nearly identically to DllExport.
I used that to shift all the heavy lifting to .NET 9 AOT compiled to WASM in a fun little side project I've been working on: https://evo.ryanpeden.com