Hide a sub button next state main button

Installation
1

Good morning,

I would like to hide the sub button if the main state is off, here is my card :

type: custom:bubble-card
card_type: button
button_type: state
name: Arrosage automatique
force_icon: false
tap_action:
  action: toggle
button_action:
  tap_action:
    action: toggle
styles: |
  .bubble-icon-container {
  background: ${state === 'on' ?  '#1bc257' : 'white'} !important;
  }
show_last_changed: true
entity: input_boolean.bout_arrosage_automatique_potager
icon: mdi:watering-can-outline
sub_button:
  - entity: input_datetime.pot_prochain_arrosage
    show_icon: false
    show_state: true

could you help me?

2

My guess it is not possible with that card.
Some cards support templates, but templates only work on the value (the part to the right of the : ).
Templates are not possible on the key (the part to the left of the : ).

Well, it is possible, but then it requires a radical shift in your setup to use Lovelace_gen and YAML-only editing.

You may have to find another card.
There is a custom button card in HACS that is extremely versatile.