podAnnotations don't use quotes, triggering error

[ams0]

NGINX Ingress controller version: v0.40.2

Kubernetes version (use kubectl version): 1.19.0

Environment: AKS

• Cloud provider or hardware configuration: AKS
• OS (e.g. from /etc/os-release): Ubuntu 18.04
• Kernel (e.g. uname -a):
• Install tools: Helm
• Others:

What happened:

I want to set podAnnotations to read exactly:

      annotations:
        prometheus.io/path: /metrics
        prometheus.io/port: "10254"
        prometheus.io/scheme: http
        prometheus.io/scrape: "true"

at the command line I use:

--set controller.podAnnotations."prometheus\.io/scrape"=true \
--set controller.podAnnotations."prometheus\.io/port"="10254" \
--set controller.podAnnotations."prometheus\.io/path"="/metrics" \
--set controller.podAnnotations."prometheus\.io/scheme"="http" \

The port numeral is created without quotes, thus triggering kubernetes/kubernetes#82296:

Error: failed to create resource: Deployment in version "v1" cannot be handled as a Deployment: v1.Deployment.Spec: v1.DeploymentSpec.Template: v1.PodTemplateSpec.ObjectMeta: v1.ObjectMeta.Annotations: ReadString: expects " or n, but found t, error found in #10 byte of ...|/scrape":true},"labe|..., bigger context ...|heus.io/port":"\"10254\"","prometheus.io/scrape":true},"labels":{"app.kubernetes.io/component":"cont|...

What you expected to happen:

Numerals are created with quotes around them.

How to reproduce it:

Deploy ingress-nginx with this command:

helm upgrade --install --create-namespace \
-n ingress \
--set controller.metrics.enabled=true \
--set controller.metrics.service.type=LoadBalancer \
--set defaultBackend.enabled=true \
--set controller.podAnnotations."prometheus\.io/scrape"=true \
--set controller.podAnnotations."prometheus\.io/port"="10254" \
--set controller.podAnnotations."prometheus\.io/path"="/metrics" \
--set controller.podAnnotations."prometheus\.io/scheme"="http" \
ingress ingress-nginx/ingress-nginx

Anything else we need to know:

I'm submitting a PR to fix the problem.

/kind bug