Yes, This function can be supported. You can use the pppoe-server max-sessions remote-mac command to configure the maximum number of users that are allowed to access a network from a MAC address.
For more details, see the product documentation:
https://support.huawei.com/hedex/hdx.do?docid=EDOC1100168821&id=EN-US_CLIREF_0314069568&lang=en