Vo2max estimation

[Garf]

This paper: https://www.researchgate.net/publication/319947872_Cycling_Power_Outputs_Predict_Functional_Threshold_Power_And_Maximum_Oxygen_Uptake

Estimates VO2Max based on age and FTP. Formula is:
VO2max (ml. kg -1. min -1 ) = age (y) × -0.313 + FTP (W. kg-1 ) × 11.733 + 27.056

So you could calculate it for everyone you know age, weight and eFTP for.