How to get client secret from existing Azure service principal

I have created a RBAC enabled service principal in Azure to configure Key Vault access within my OS using environment variables. When you create a service principal, the Azure CLI responds with the service principal details, containing the clientSecret value. Creation command:

az ad sp create-for-rbac -n <http://my-name> --sdk-auth

I would like to know if and how I can request the clientSecret later on. When I use

az ad sp show --id <my-service-principal-uuid>

or

az ad sp credential list --id <my-service-principal-uuid>

the clientSecret is not in the response information.

Is there any way to retrieve the clientSecret other than at the moment of creation?

PS C:\> az ad sp credential reset --name foo
{
  "appId": "...",
  "name": "foo",
  "password": "...",
  "tenant": "..."
}