Why you assume NG?
Sorry if it was MAX.
Its a generic question
I told you you might get generic charts with: filed length, elevation, temperature, relative wind and contamination. For 2537 m runway at 1698 ft with QNH 1010 and temperature 27, you read out speeds, thrust settings and margin for 2500m at 2000ft and 30c and off you go if everything ahead of you is reasonably flat. But of course, such a method has to be approved by relevant authority and covered in performance manual or similar. Your friend calling from half the world should better get acquainted with company's material, rather than seeking an advice from someone who needs not be versed in particular company's operation.