How to set dynamic output for a job in GitHub actions?

I want to set the GITHUB_OUPUT variables dynamically for a job and access them in another job. Below is what I am trying.

 par:
  runs-on: ["${{inputs.runner_name}}"]
  output:
  **<HERE I WANT THE VARIABLE OUTPUT TO BE DYNAMIC>**
  steps:
   - name: Par
     shell: powershell
     id: test
     run: |
         cd ${{github.workspace}}
         $json_path =  Get-ChildItem ${{inputs.param_name}} -recurse  | %{$_.FullName}
         $json = Get-Content  $json_path -Raw | ConvertFrom-Json
         $json.psobject.properties | ForEach {  $NAME=$_.Name ; $VALUE=$_.Value; echo $NAME,$VALUE ;echo "$NAME=$VALUE" >> $GITHUB_OUTPUT }
                

In the next job i want to do ( if ${{ needs.par.outputs.<here I know what variable I should reference> }} -ne null )

Is that possible?