How can I run each iteration/sequence of a for_each loop in parallel, instead of in sequence?

Configuration
1

I have a script that iterates over an array and does something to each instance.

Right now an iteration starts after the previous iteration finishes.

How can I make it so each iteration runs in parallel?

Essentially I want to “set volume AND THEN speak text” on all the matched speakers at the same time. Not sure if that makes sense?

repeat:
  for_each: "{{ idle_matched_speakers }}"
  sequence:
    - action: media_player.volume_set
      metadata: {}
      data:
        volume_level: 0.6
      target:
        entity_id: "{{ repeat.item }}"
    - action: tts.speak
      metadata: {}
      data:
        cache: true
        media_player_entity_id: "{{ repeat.item }}"
        message: "{{ tts_message }}"
      target:
        entity_id: tts.google_en_com
      enabled: true
enabled: true
2

I would put to be repeated section into script, call the script without waiting for response.

Or you can check parallel also from here: