Issue with Loading Alertmanager Config in Helm

I cannot seem to get alertmanager to load the the configuration. Here is my helm values:

alertmanager:
  # Using the config, alertmanager.yml file is created.
  # We no longer need the config file as query services
  # delivers the required config.

  extraArgs:
    config.file: /etc/alertmanager/alertmanager.yml
    log.level: debug
  config:
    global:
      resolve_timeout: 1m

    templates:
      - '/etc/alertmanager/*.tmpl'

    receivers:
    - name: 'slack-notifications'
      slack_configs:
      - channel: '#alert-test'
        api_url: ************
        send_resolved: true
        title: '{{`{{ template "slack.title" . }}`}}'
        text: '{{`{{ template "slack.text" . }}`}}'

    route:
      receiver: 'slack-notifications'

  # Templates are no longer needed as they are included
  # from frontend placeholder while creating alert channels.
  templates:
    title.tmpl: |-
      {{`
        {{ define "slack.title" }}
        [{{ .Status | toUpper }}{{ if eq .Status "firing" }}:{{ .Alerts.Firing | len }}{{ end }}] {{ .CommonLabels.alertname }} for {{ .CommonLabels.job }}
        {{- if gt (len .CommonLabels) (len .GroupLabels) -}}
          {{" "}}(
          {{- with .CommonLabels.Remove .GroupLabels.Names }}
            {{- range $index, $label := .SortedPairs -}}
              {{ if $index }}, {{ end }}
              {{- $label.Name }}="{{ $label.Value -}}"
            {{- end }}
          {{- end -}}
          )
        {{- end }}
        {{ end }}
      `}}
    text.tmpl: |-
      {{`
        {{ define "slack.text" }}
        {{ range .Alerts -}}
        *Alert:* {{ .Labels.alertname }}{{ if .Labels.severity }} - *{{ .Labels.severity }}*{{ end }}

        *Summary:* {{ .Annotations.summary }}
        *Description:* {{ .Annotations.description }}

        *Details:*
          {{ range .Labels.SortedPairs }} • *{{ .Name }}:* `}}`{{`{{ .Value }}`}}`{{`
          {{ end }}
        {{ end }}
        {{ end }}
      `}}
  configmapReload:
    ## If false, the configmap-reload container will not be deployed
    ##
    enabled: true

If I add or remove the extra args I still cannot get the config to reload. The alertmanager pod starts up but has only the default receiver and not my receiver.

can I get support on this pls? I need a declarative way to define alert channels (not through the UI)

There is no declarative way to define them as of now. Please see https://github.com/SigNoz/signoz/issues/1273