Dynamic metadata on BBC Radio 1 & 1Xtra but no other BBC stations

Hi all.

I have noticed that on the iPlayer app playing the new HLS streams that Radio 1 and Radio 1Xtra both have dynamic metadata with information about the track playing, the show, and Newsbeat headlines. None of the other stations do this. Is there any reason why these two are different, and if it works for them, could it be made to work with the other BBC nationals?

It was the same situation with the old Shoutcast AAC streams.

Thanks and regards,
Nick