However, that doesn't necessarily mean a PR to add a value will be accepted.
The `values.yaml` API is intended to maintain a *minimal core set of configuration* that most users will use.
For bespoke use cases, [Helm Chart Customization](https://istio.io/latest/docs/setup/additional-setup/customize-installation-helm/#advanced-helm-chart-customization) can be used

  //      implementations prior to v1.22)
  //   2. Signer whose configured maximum is shorter than the requested duration
  //   3. Signer whose configured minimum is longer than the requested duration
  //
  // The minimum valid value for expirationSeconds is 600, i.e. 10 minutes.
  //
  // +optional
  optional int32 expirationSeconds = 8;

    defaultPodDisruptionBudget:
      enabled: true
      # The values aren't mutable due to a current PodDisruptionBudget limitation
      # minAvailable: 1

    # A minimal set of requested resources to applied to all deployments so that
    # Horizontal Pod Autoscaler will be able to function (if set).
    # Each component can overwrite these default values by adding its own resources

                        port.
                      items:
                        properties:
                          number:
                            maximum: 65535
                            minimum: 1
                            type: integer
                        required:
                        - number
                        type: object
                      type: array

  optional k8s.io.api.core.v1.PodTemplateSpec template = 2;

  // An update strategy to replace existing DaemonSet pods with new pods.
  // +optional
  optional DaemonSetUpdateStrategy updateStrategy = 3;

  // The minimum number of seconds for which a newly created DaemonSet pod should
  // be ready without any of its container crashing, for it to be considered
  // available. Defaults to 0 (pod will be considered available as soon as it

                      "common_tls_context": {
                        "tls_params": {
                          "tls_minimum_protocol_version": "TLSv1_3",
                          "tls_maximum_protocol_version": "TLSv1_3"
                        },
                        "alpn_protocols": [
                          "h2"

                maximum: 255
                minimum: 2
                type: integer
              echoInterval:
                description: Configures the minimal echo receive transmission interval
                  that this system is capable of handling in milliseconds. Defaults
                  to 50ms
                format: int32
                maximum: 60000
                minimum: 10
                type: integer

{{- $gateway := index .Values "gateways" "istio-egressgateway" }}
{{- if ne $gateway.injectionTemplate "" }}
{{/* This provides a minimal gateway, ready to be injected.
     Any settings from values.gateways should be here - these are options specific to the gateway.
     Global settings, like the image, various env vars and volumes, etc will be injected.
     The normal Deployment is not suitable for this, as the original pod spec will override the injection template. */}}

{{- $gateway := index .Values "gateways" "istio-ingressgateway" }}
{{- if ne $gateway.injectionTemplate "" }}
{{/* This provides a minimal gateway, ready to be injected.
     Any settings from values.gateways should be here - these are options specific to the gateway.
     Global settings, like the image, various env vars and volumes, etc will be injected.
     The normal Deployment is not suitable for this, as the original pod spec will override the injection template. */}}

  // address into 24 bits for the network portion and 8 bits for the host portion.
  // To allocate 256 IPs, set this field to 8 (a /24 mask for IPv4 or a /120 for IPv6).
  // Minimum value is 4 (16 IPs).
  // This field is immutable.
  // +required
  optional int32 perNodeHostBits = 2;

  // ipv4 defines an IPv4 IP block in CIDR notation(e.g. "10.0.0.0/8").