config.yaml

# ...other config...
  playing:
    type: yasb.custom.CustomWidget
    options:
      label: "{data}"
      label_alt: "{data}"
      class_name: now-playing
      exec_options:
        run_cmd: [LOCATION OF EXE FILE]
        run_interval: 5000
        return_format: string
      callbacks:
        on_left: [LOCATION OF EXE FILE] toggle
# ...other config...