Rancher - Allow specific secrets for roles


I have a usecase, where I have to give some specific accesses to a user in Rancher.
Most of the things works fine, but at the moment, it looks like I have to give the user access to all secrets in a project in order to allow that user to pull images from a custom registry.

How do I achieve this?
Attached a screenshot, with an example (not working)

I’ve also tested with “secrets/regcred”, but that did not work either