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You can utilize $_ within an Ansible PowerShell scriptblock by enclosing the scriptblock in single quotes and embedding the variable using double quotes. For example:

- name: Example task
  hosts: localhost
  gather_facts: no
  tasks:
    - name: Run scriptblock with $_
      win_shell: |
        Invoke-Command -ScriptBlock {'Get-ChildItem | ForEach-Object {Write-Output $_.Name}}'}
      register: output
    - name: Print output
      debug:
        var: output.stdout_lines

In this example, the PowerShell scriptblock contains the command "Get-ChildItem", which retrieves a list of files and directories, and then piped into "ForEach-Object", which outputs the name of each item using the "$_.Name" syntax. The scriptblock is then executed using the "Invoke-Command" cmdlet, and the output is registered to the "output" variable. Finally, the output is printed using the "debug" module.