Blocking Hotsposts

Just wondering if anyone has any suggestions for the below.

so I have next dns running on my router and on the kids phone, so when there bold I turn it off and the internet is timed to turn off on the kids Vlan at 11pm. What I have noticed now is the kids will hotspot off there phone and things are back to normal for them.  Is there some way of blocking all traffic on the phone using NextDNS? So the kids can’t hotspot . Obviously I can block the preset ones in next dns but it’s more for online gaming and stuff.