From what I’ve seen, the Nokia G-010S-A isn't really compatible with OpenWrt and LuCI out of the box. The guide on hack-gpon.org shows how to flash it with the Nokia G-010S-P firmware, which is a different version of the stock firmware, but it's not OpenWrt. Unless there’s been a recent breakthrough, I’m not aware of any way to install OpenWrt on it directly.
If you're looking for more control, you might want to consider using a separate OpenWrt router in front of the G-010S-A as an ONU. That way, you can manage the network through OpenWrt while still using the G-010S-A as the basic GPON device.