Multi Homepods to play radio using siri

1

Hi Guys,
I have two homepods in my room, both with diffrent entity id(media.1_hp, media.2_hp).
I have successfully created a buttion in homeassistant, and import to homekit with the buttion name “Radio”

Here is the yaml:

      radio:
        unique_id: "num0005"
        turn_on:
          service: media_player.play_media
          target:
            entity_id: media_player.1_hp
          data:
            media_content_id: http://stream.live.vc.bbcmedia.co.uk/bbc_world_service
            media_content_type: music
            announce: true
        turn_off:
          service: media_player.media_stop
          target:
            entity_id: media_player.1_hp

Now, what I can do is, when I using siri to open “radio”, the homepod 1_hp can play the radio.
what i wannt, is when i use siri to open “radio”, the current homepod that i use will play the radio, other than the 1_hp.

Can you help on this?
Thanks