helm-external-secrets/docs/snippets/conjur-ca-bundle.yaml

....
spec:
  provider:
    conjur:
      # Service URL
      url: https://myapi.conjur.org

      # [OPTIONAL] base64 encoded string of certificate
      caBundle: "<base64 encoded cabundle>"

      # [OPTIONAL] caProvider:
      # Instead of caBundle you can also specify a caProvider,
      # which retrieves the cert from a Secret or ConfigMap
      caProvider:
        type: "Secret" # Can be Secret or ConfigMap
        name: "<name of secret or configmap>"
        key: "<key inside secret or configmap>"
        # namespace is required for ClusterSecretStore
        # but not relevant for SecretStore
        namespace: "my-cert-secret-namespace"
  ....