ArgoCD: run a specific pipeline after a specific succesful ArgoCD deploy

We use ArgoCD Applications to deploy a set of Kubernetes resources. How can I start a specific pipeline after a specific succesful Application run?

First I thought that starting such a pipeline could be done from an ArgoCD PostSync. As I understand now, a PostSync is a general hook, not a specific hook for 1 ArgoCD application. Correct?

Let me simplify my question. I have 2 ArgoCD applications. I want to execute action 1 (eg start a pipeline 1) after a successful sync of application 1. And action 2 only after a successful sync of application 2. How can I specify that?

Applications:

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: app1
  namespace: argocd
spec:
  project: default
  source:
    repoURL: https://github.com/app1repo/apps-1.git
    targetRevision: HEAD
    path: app1path
  destination:
    server: https://kubernetes.default.svc
    namespace: app1

And Application2:

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: app2
  namespace: argocd
spec:
  project: default
  source:
    repoURL: https://github.com/app2repo/apps-2.git
    targetRevision: HEAD
    path: app2path
  destination:
    server: https://kubernetes.default.svc
    namespace: app2

Action 1 should only be done after the succesfull sync of Application1:

apiVersion: batch/v1
kind: Job
metadata:
  generateName: app-slack-notification-
  annotations:
    argocd.argoproj.io/hook: PostSync
    argocd.argoproj.io/hook-delete-policy: HookSucceeded
spec:
  template:
    spec:
      containers:
      - name: app1-post-sync
        image: busybox
        command: ["echo", "This simulates an **app1** post sync action"]
      restartPolicy: Never

And action 2 after the succesfull sync of Application2:

apiVersion: batch/v1
kind: Job
metadata:
  generateName: app-slack-notification-
  annotations:
    argocd.argoproj.io/hook: PostSync
    argocd.argoproj.io/hook-delete-policy: HookSucceeded
spec:
  template:
    spec:
      containers:
      - name: app2-post-sync
        image: busybox
        command: ["echo", "This simulates an **app2** post sync action"]
      restartPolicy: Never

Just put the PostSync config files in the Helm chart.

When the Application updates, the PostSync is done as described in the Helm chart of the Application.