hello , the share vlan means different ETH port using same vlan service ? or the ETH port transparent the VLANs ;
if requirement different ETH port using same vlan service, can Create WAN interface in the ONT , and bind the WAN interface with ETH port (ETH port requirement set as L3 mode)
if requirement ETH port transparent the VLANs , need from the OLT configure VLAN transparent Or translate for the ONT ETH port in the ONT service profile .