save az cli output as var and use it later

pipeline.yaml

    jobs:
      - job: 
        displayName: Your job
        variables:
          var-name: 'unknown'
        steps:
          - task: AzureCLI@2
            inputs:
              azureSubscription: 'sp-connection-name'
              scriptType: 'pscore'
              scriptLocation: 'inlineScript'
              inlineScript: |
                $tmp= & az blah-blah-blah -o tsv
                Write-Output("##vso[task.setvariable variable=var-name;]$tmp")
          - script: |
                echo $(var-name)