[gcode_macro IF_TEST]
gcode:
M117 Value: { present }
{% if present == 1 %}
  SET_SERVO SERVO=my_servo ANGLE=103
  G4 P1375
  SET_SERVO SERVO=my_servo ANGLE=88
  M117 test pass
{% elif present == 0 %}
  M117 it equals zero
{% else %}
  M117 Unknown Value: { present }
{% endif %}