It would be useful, and easy to implement, having a link from the crate page, in the License field, to the corresponding license page in https://spdx.org/licenses. It's just a matter of prefixing https://spdx.org/licenses/ and appending .html to the SPDX Id when it doesn't start with custom.
For example:
License: GPL-3.0-or-later
alire-project / alire
Command-line tool from the Alire project and supporting library
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