All the info you are seeking for that model is in the Glowworm MI’s. Qnw is stated in steps across the full modulated range. The MI’s should be in the pack that was handed over when the boiler was commissioned.
Please don’t be tempted to use the information to undertake any procedures that require a Gas Safe Registered Person.
Glowworm (and others) generally state that the gas rate is factory set and no attempt should be made to adjust it (at the boiler) by anyone ( Gas Safe Registered or not). Adjustments, if required, to the installation pipework from the ECV to the boiler may only be made by Gas Safe Registered persons.
Setting the Glowworm on to maximum and measuring at the gas meter is fine.