Plotly Graph Card - Making "show_value" stand out?

I would like to increase the “show_value” text by changing the font / size / weight. Is this possible?
I have tried to do this with card-mod, which has worked for me with other Cards, but not with plotly.
This is my simple yaml:

type: custom:plotly-graph
entities:
  - entity: sensor.motorhome_ds18b20_ds18b20_temperature
    name: Outside Temperature
    time_offset: 3h
    filters:
      - sliding_window_moving_average: null
        window_size: 5
    show_value: true
    line:
      shape: linear
      width: 1
hours_to_show: 12

Regards, Martin

Did you try textfont, as in Photovoltaik show monthly production with estimated values · dbuezas/lovelace-plotly-graph-card · Discussion #394 · GitHub

Great card but not so great documentation :wink:

Thanks for the suggestion, Chris,

Yes, I have now. But no luck, I’m afraid!

Regards, M.