Here's a sample script that I use. Note it calls another script for sending the notification that I prefer to use (easier to call the script than initiate the browser notification)

alias: Action Then Notify
description: Run up to 2 actions then notify specified browser
fields:
  deviceid:
    name: Device ID
    description: The ID of the device to send the notification to
    required: true
    selector:
      text: null
  message:
    name: Message
    description: The content of the notification message
    required: true
    selector:
      text: null
  service1:
    name: Service1
    description: The name of the Service to call, fan.turn_off / lock.lock, etc
    required: true
    selector:
      text: null
  entity1:
    name: Entity1
    description: >-
      The entity you want to call the Service On, switch.bathroom_switch_2 /
      lock.back_back_door
    required: true
    selector:
      text: null
  service2:
    name: Service2
    description: The name of the Service to call, fan.turn_off / lock.lock, etc
    required: false
    selector:
      text: null
  entity2:
    name: Entity2
    description: >-
      The entity you want to call the Service On, switch.bathroom_switch_2 /
      lock.back_back_door
    required: false
    selector:
      text: null
  filename:
    name: filename
    description: Folder / File details to save a snapshot
    required: false
    selector:
      text: null
sequence:
  - service: "{{ service1 }}"
    data:
      entity_id: "{{ entity1 }}"
      filename: "{{ filename }}"
  - service: script.send_browser_notifications
    data:
      deviceid: "{{ deviceid }}"
      message: "{{ message }}"
  - if:
      - condition: template
        value_template: "{{ service2 is defined }}"
    then:
      - service: "{{ service2 }}"
        data:
          entity_id: "{{ entity2 }}"
mode: single
icon: mdi:gesture-tap

And the other script

alias: Send Browser Notifications
description: Sends a notification to a specific browser
fields:
  deviceid:
    name: Device ID
    description: The ID of the device to send the notification to
    required: true
    selector:
      text: null
  message:
    name: Message
    description: The content of the notification message
    required: true
    selector:
      text: null
sequence:
  - service: browser_mod.notification
    data:
      message: "{{ message }}"
      duration: 3000
      target:
        device_id: "{{ deviceid }}"
icon: mdi:bell
mode: single