[Freeswitch-users] Use rates from lcr in nibblebill module

Hi, I want to use module lcr to find a best route and his rate , then make a call and bill on that rate with nibblebill module. lcr return variable "lcr_auto_route" that contains "[lcr_rate=xxx]" variable for new channel. To use nibblebill i need to set "nibble_rate" = "lcr_rate". What is best method to do that? Is there a way to do that with standard tools, without use external scripts? Thanks, Yuriy