Triggering workflow on PR review request event

I would like to trigger a workflow when a review is requested from a user or a team (or a new PR with a reviewer is created).

I’ve tried triggering the workflow with:

on:
  pull_request:
    types: [review_requested]

but that didn’t trigger the action to run so I tried

on: [pull_request]

jobs:
  test_action:
    runs-on: ubuntu-latest
    steps:
      - run: echo ${{github.event.action}}

to see what action is sent when a reviewer is added. I didn’t get an action returned from requesting a review but I did from other actions.

Is there a way to trigger an action to run when specific reviewers are requested?