GPON ONU module with UART interface

There is a customer who is looking for a energy meter with fibre optic interface.
Why fibre is because the Utility also owns a Telco company that provides fibres to home and they plan to use the same network for electric metering AMI.
They have about 10,000 homes having fibre already and plan to roll out 300,000 homes over the next 4 years.
Now, what we are looking for is to add fibre interface in our energy meter. Which essentially means that we need to GPON based ONT/ONU.
Can you please share whether there is any solution to achieve this or can link us up with your application team so that we can discuss further?

Please refer below block diagram

Thanks & Regards,