Guidance needed on assigning different nextdns configuration to different pfsense vlan

Hi,

I am a novice pfsense user and a long term nextdns user. My current configuration allows all vlan to use a single nextdns configuration. So far it has been working well. As my children start working on laptop this year, I would like to have a different nextdns configuration for their laptop on their separate vlan.  Does anyone know how this can be done? I have installed nextdns on pfsense using the standard guide installation command.

vlan example 

192.168.1.0/24 ==> Rest of family

192.168.30.0/24 ==> children vlan

Thank you In advance.

Sean