Not sure why you think WGSL is owned by the Rust community--it's clearly owned by the W3C. (That's part of why it moves so slowly.) WESL [1] is the community-owned set of extensions to WGSL that, while incomplete, promises to move it much closer to Rust.
It's interesting that Slang looks more like Rust than WGSL does, despite WGSL kind of being de facto "owned by" the Rust community.