According to information on the Huawei website, Huawei routers can be used for expansion, but which model you could use is unfortunately not mentioned. If a solution with 4G is also possible, there is also an Orbi LTE 4G router from Netgear, which can download up to 1.2 Gbit/s via 4G, can be expanded with Orbi Mesh components and already provides a very good WLAN network, but the Netgear Orbi would not be WiFi 6 capable.