Running Google Workflows in Parallel

I have a collection of documents in cloud firestore, every night I would like to run Workflows on each document to perform a series of transformations. The transformation of one document has no effect on another. I currently have a for loop in my YAML file that does the transformation of each document one at a time. I was wondering if I can perform the transformation to all the documents in parallel instead of one at a time.

Workflow steps can be done in parallel:

https://cloud.google.com/workflows/docs/reference/syntax/parallel-steps#example_of_parallel_branches

Code snippet:

main:
  params: [args]
  steps:
    - init:
        assign:
          - user: {}
          - notification: {}
    - parallelStep:
        parallel:
          shared: [user, notification]
          branches:
            - getUser:
                steps:
                  - getUserCall:
                      call: http.get
                      args:
                        url: ${"https://example.com/users/" + args.userId}
                      result: user
            - getNotification:
                steps:
                  - getNotificationCall:
                      call: http.get
                      args:
                        url: ${"https://example.com/notification/" + args.notificationId}
                      result: notification