Unable to Load Grafana Dashboard to Specific Folder

[RichieRogers]

I'm trying to upload dashboards into a specific folder, eg:
My-Dashboards
So, if I have the following ConfigMap:

apiVersion: v1
kind: ConfigMap
metadata:
name: test-dashboard
labels:
grafana_dashboard: "1"
namespace: monitoring
annotations:
#grafana_dashboard: "My-Dashboards" <--- tried this one first
k8s-sidecar-target-directory: "/tmp/dashboards/My-Dashboards" <---- also tried this way
data:
test-dashboard.json: |
{
blah blah blah
}

It "should" upload this dashboard into the GUI under Dashboards -> My-Dashboards.
However, it only appears in the Dashboards folder.
I've even restarted the Grafana pod, but it makes no difference.
Am I missing some other config setting?

These are the labels on the deployment if it helps identify version:
app.kubernetes.io/instance=kube-prometheus-stack
app.kubernetes.io/managed-by=Helm
app.kubernetes.io/name=grafana
app.kubernetes.io/version=11.2.1
helm.sh/chart=grafana-8.5.2

Thanks,
Richie