esphome/tests/components/nextion/common_waveform_lambda.yaml

# Waveform commands from a lambda with no waveform sensor configured, so
# USE_NEXTION_WAVEFORM is not defined.
display:
  - platform: nextion
    id: main_lcd
    lambda: |-
      id(main_lcd).open_waveform_channel(37, 0, 10);
      id(main_lcd).add_waveform_data(37, 0, 42);