Recursively Check In all D365 CRM SOlutions for one APP

Yes you can, below a simple sample:

parameters:
  - name: appName
    type: string

steps:
  - script: |
      $solutions = Get-SolutionsForApp -AppName ${{ parameters.appName }}
      foreach ($solution in $solutions) {
        TriggerSubPipeline -SolutionName $solution.name
      }

You’ll need to implement Get-SolutionsForApp to query Dataverse for solutions tied to the app, and TriggerSubPipeline to call the extraction/check-in pipeline.