APIKeyAuth secret safety question - possibility of using hashed values?

*Description*:
Per the configuration, the APIKeyAuth secret is a standard K8S opaque secret and the actual tokens are simply b64 encoded.

Has it been considered to enable the used of hashed secrets (SHA256|SHA512|somethingelse) to have some baseline security much like an htpasswd file provides?
This is beyond any considerations of the fact that someone could actually get hold of the secret.

Thank you,
Ed