SRX DHCP Client with auth

Hello, 

I'm trying to bypass a Orange Livebox (French ISP) by a Juniper SRX320.

It seems to be working with DHCP, but I need to specify auth on the interface. 

I have a username and a password and they are mandotory for me to get the IP, but I can't find how configure auth in a dhcp client interface on the SRX. I need the option 90.

Does someone know I can configure my DHCP client ?

By advance, 

Thanks.