SRX how to tell SRX to use inet.0 for multicast forwarding

Hi Everyone,

By defaut SRX uses  inet6.0   for multicast traffic, let say  I created  a static  route  238.0.0.0/8  in  inet.0.

How can we tell SRX  to  use inet.0   for  238.0.0.0/8  instead of inet6.0?

Thanks and have a nice weekend!!