Getting message read receipts for multiple messages with API

We’re looking into upgrading our RC from 0.59 to the latest version for the “Read receipts” feature.
but i only see a way to get it for a specific message. what i would like is to get the receipts either for a batch of messages by id, or when i’m getting the messages throught the livechat api (stream-notify).

Does anyone have any idea how to do it, and not to send a million calls, one per message?

Thanks in advance!