I don't think describing these as "experimental" makes sense, and badges are pretty much deprecated:
Note: crates.io previously displayed badges next to a crate on its website, but that functionality has been removed. Packages should place badges in its README file which will be displayed on crates.io (see the readme field).
I don't think describing these as "experimental" makes sense, and badges are pretty much deprecated:
https://doc.rust-lang.org/cargo/reference/manifest.html#the-badges-section