Identify user (moderator/chat_by - who sent a message) in page's conversation - Facebook API

Question

I'm using Facebook API to get messages data from a page (https://developers.facebook.com/docs/graph-api/reference/v13.0/conversation/messages)

By now, I can only get Page Name as Sender's name, I want to identify exactly which moderator sent out the message, Is there a way to do that?

I found a similar unresolved question here

Please help, Thank you!