alz/azuredevops/pipelines/bicep/templates/helpers/bicep-variables.yaml

---
parameters:
  - name: parametersFileName
    type: string

steps:
  - pwsh: |
      $fileName = "$${{ parameters.parametersFileName }}"
      Write-Host "Getting variables from $fileName"
      $json = Get-Content -Path $fileName | ConvertFrom-Json

      foreach ($key in $json.PSObject.Properties) {
        $envVarName = $key.Name
        $envVarValue = $key.Value
        echo "##vso[task.setvariable variable=$envVarName;]$envVarValue"
        echo "Set $envVarName to $envVarValue"
      }
    displayName: Import Variables from File