Sending the Framed-IP-Address from a module

I got a complicated schema where my radius server needs to send the Framed-IP-Address based on the results of a redis-db query so, I would like to know if if the post-auth part of my default config I can do that. Something like (or any other solutions doing this): update reply { Framed-IP-Address := xxx.xx.xx.xx } where xxx.xx.xx.xx is an ip address returned by a module. Much appreciated.