Microsoft Teams Graph API: get viewpoint lastMessageReadDatetime in channels like in chatsList

As returned in chatList beta graph API ( GET https://graph.microsoft.com/beta/users/8b081ef6-4792-4def-b2c9-c363a1bf41d5/chats ), it would be very useful to have the viewpoint lastMessageDateTimeRead info also for channels.
It would be also very nice to have info about who read a mesage i wrote.