I'm not sure that's available with the api, right now all it does is open the chat, it's not interacting with chat on any level to get those kinds of stats.
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On main group page you have the necessary indicator: inside <div class="groupMemberRow">...</div> you have <a class="steamLink" href="steam://friends/joinchat/103582791432125620">15 in Chat</a>
0 in Chat if it is empty
This XPath can be used: //div[@class="groupMemberRow"]//a[@class="steamLink"]/text()
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I like the feature of having the group chat button on the forum page, and it would be even a bit cooler if you could see whether or not the room is populated before entering, as that would influence my decision whether or not to join.
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