Azure DevOps matrix sample

matrix.yml

name: matrix1

stages:
- stage: matrix_demo
  jobs:
  - job: job_a
    pool:
      vmImage: ubuntu-latest  
    steps:
    - powershell: |
        $val = '{ "proj1": { "PramA": "proj1-val-A", "PramB": "proj1-val-B" }, "proj2": { "PramA": "proj2-val-A", "PramB": "proj2-val-B" }, "proj3": { "PramA": "proj3-val-A", "PramB": "proj3-val-B" } }'
        echo "##vso[task.setvariable variable=matrix;isOutput=true]$val"
      name: targetList

  - job: job_b
    dependsOn: job_a
    pool:
      vmImage: ubuntu-latest  
    strategy:
      matrix: $[ dependencies.job_a.outputs['targetList.matrix'] ]
      maxParallel: 3
    steps:
    - script: |
        echo '$(PramA)'
        echo '$(PramB)'