Triggering an Azure Pipeline build after multiple other pipelines have all completed

I know you can trigger a pipeline upon completion of another pipeline. eg.

resources:
  pipelines:
    - pipeline: A
      source: A
      trigger:
        branches:
          include:
            - master

But what about if I have multiple pipelines and I want to wait for all of them to complete before triggering. Is that possible?

resources:
  pipelines:
    - pipeline: A
      source: A
      trigger:
        branches:
          include:
            - master
    - pipeline: B
      source: B
      trigger:
        branches:
          include:
            - master

My impression is the above would trigger on either A or B instead of A and B