AR750 mwan3 load balancing bitrate limit question

Hello, I can make a dual WAN with 2 different ISP connections with no problems.
My question is: is it possible to make a rule or something to limit the bitrate for WAN1(ISP1 is 10mb) to 10mb and WAN 2 (ISP 2 is 7mb) to 7mb so when 10mb is reached on WAN1, mwan3 adds WAN2 connection for 7mb more?
Thank You!