Is it possible to pass the actual number of replicas to a pod in a StatefulSet?

General Discussions
1

I created a StatefulSet and I want to pass to each of its pods the number of pods in this StatefulSet through an environment variable named REPLICASIZE. Is this possible? My yaml looks as:

---
    apiVersion: apps/v1
    kind: StatefulSet
    metadata:
      name: php-app-4-rcweb
      namespace: kube-system
      labels:
        app: mypod
    spec:
      replicas: 3
      selector:
        matchLabels:
          app: mypod
      template:
        metadata:
          labels:
            app: mypod
        spec:
          containers:
          - name: php-apache
            image: my-registry.local:5000/my-image:0.0.1  # Or your custom image

            env:
             - name: TZ
               ...
             - name: REPLICASIZE
               value: ................

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Cluster information:

Kubernetes version:

$ k3s -version
k3s version v1.33.3+k3s1 (236cbf25)
go version go1.24.4

Cloud being used: bare metal

Installation method:

curl -sfL https://get.k3s.io | sh -s -- --cluster-cidr=142.200.0.0/16 --service-cidr=142.201.0.0/16

Host OS: Ubuntu Linux 24
CNI and version: default
CRI and version: default