Reservation rooms in calendar app

Hallo, I'd like to use the rooms that I've created in Outlook in  calendar app of SharePoint online.  In SharePoint I've create a list that include rooms and with "calendar"-->  "list setting"--> "create column" I've inserted them. But when I "Connect outlook" these rooms doesn't use the Outlook rooms...

I tryed this solution  too: https://spform.com/miscellaneous/reservation-resources-sharepoint-2013-sharepoint-2013-online-office-365

But I can't activeted the wsp downloaded.

What Should I do?

I need something like this:

Thank you so mutch

Alex