Do any of the Xfinity Modems support WAN Aggregation LACP-IEEE802.3ad?

Do any of the Xfinity Modems support WAN Aggregation (LACP-IEEE802.3ad), since with the fiber plans, the only way we as customers can get the full bandwidth for 1100Mbps or the 1200Mbps plans is to use WAN Aggregation (LACP-IEEE802.3ad). It seems counter intuitive that Xfinity sells this plans to customers well knowingly that they are not getting more than 940Mbps at any time due to the 1Gbps limit with the ethernet protocol.