gCode Command for End-Effector

Is there a gCode command for the end-effector angle? I tried G202 N3 V40 and G202 N3 V120 for example with no success.

All I can find is a API command.

You’d read the doc carefully: https://github.com/uArm-Developer/SwiftProForArduino/blob/Version_V4.0/doc/uArm%20Swift%20Pro%20Protocol%20V4.0.3_en.pdf
For example:
G2202 N3 V120 F100