On every GitHub repository or folder with a Cargo.toml file, scroll to the bottom of the page to see a list of its npm dependencies and their descriptions.
cratehub also adds convenient links to:
the Cargo.toml file
crate info
support create data copy (eg: rustfmt-nightly = "1.4.21")
GitLab will be supported in the near future (some functions of the current version need to be adjusted. I think that after the adjustment, GitLab will be supported).
Other GitLab server information display itself is not complicated, I think. The problem is that you need to know that the website you visit is a GitLab server, which may require the permission to write browser extensions. This needs to be tested.