Key Vault integration in local dev environment

I am playing around with the preview of the Key Vault integration as outlined here:
https://azure.microsoft.com/en-us/blog/simplifying-security-for-serverless-and-web-apps-with-azure-functions-and-app-service/
and here:
https://docs.microsoft.com/en-us/azure/app-service/app-service-key-vault-references

This all looks fine.

But what is the story for local development in such cases?
Currently, I just get back the original string value of the app setting, like `@Microsoft.KeyVault(SecretUri=https://...`

Thanks!