@Manu-Verma , please see the details in the link below. Please note that Modalai ESC calibration is not the same thing as the typical ESC calibration. QGC does not support calibrating ModalAI ESCs and it needs to be done using voxl-esc tools running either directly on VOXL2 or a Linux PC.
https://gitlab.com/voxl-public/voxl-sdk/utilities/voxl-esc/-/blob/dev/voxl-esc-tools/calibration.md