We have to use the action "Set Audio Volume".
To working with variables, it depends on headset is plugged in or not.
Speaker Headset Plugged --------------------------- --------------------------- volume_alarm_speaker volume_alarm_speaker volume_music_speaker volume_music_headset volume_notification_speaker volume_notification_speaker volume_ring_speaker volume_ring_headset volume_system_speaker volume_system_headset volume_voice_earpiece volume_voice_headsetIt also auto reduce the notification and ring volumes when plugged the headset.
So it's good to re-apply the volume profile when plugged and unplugged the headset.