How can I get the name of the user that approved the deployment and echo the information into a script step?

Here’s how I’ve setup azure devops pipeline yml with approval requirement:

1. set up an environment and define the user that can approve it
2. have the following stage in my yml

    stages:
    - stage: authorise_deployment`
      jobs:
      - deployment: deploy
        environment: env
        strategy:
        runOnce:
         deploy:
          steps:
            - task: Bash@3
              inputs:
                targetType: 'inline'
                script: echo 'Name of approver'