how to get the names of non-contact member in a skype group conversation?

I want to know how to get the names of non-friends in multi-person conversation in web.skype.com.

For example: in a multi-person conversation, there is a user A who is not my contact, but the web.skype web page can display the name of user A. Through Chrome's network tools, I am only getting a conversation history message record request I have seen the name of user A, but if user A has not sent a message, all the data obtained by request does not contain the name of user A.

If anyone knows and tells me how to get it, I would appreciate it