How to get community hub subscribers count in Steam API?

I can get group members list by parsing these endpoints:

• https://steamcommunity.com/groups/Valve/memberslistxml/?xml=1
• https://steamcommunity.com/groups/12345/memberslistxml/?xml=1

So the mask is https://steamcommunity.com/groups/{GROUP NAME OR GROUP ID}/memberslistxml/?xml=1

But I want to get the number of subscribed users to official APP community hub page and the only place I found this number is on search results, such as:

• https://steamcommunity.com/search/groups/?text=Counter-Strike%3A%20Global%20Offensive

Which gives me:

Counter-Strike: Global Offensive - Game hub
3,227,371 members in this group

I'm trying to get this 3,227,371 number by API, but I don't know where to find it, because community hub page is not a group. Or there is no API for that and I need to parse search results directly?

Some third party websites, SteamDB for example, somehow get this data and I want to know how.