There used to be a tab for “Charts” but I can’t find it any longer. I’ve attached the “Charts” tab from freestanding TIDAL, which as well is missing the Billboard charts — but I can’t even find this tab in Roon’s version of TIDAL.
You can force a Tidal sync from Roon settings/Services just click on sync button , other than that it can take a while for Roon to perform its Normal updates from Tidal.