Mushroom Chips Card icon colour change

Configuration Frontend
15

I found a solution here via card_mod but I’m still wondering why the mushroom icon_color does not accept a theme color.

type: custom:mushroom-chips-card
chips:
  - type: template
    entity: update.home_assistant_supervisor_update
    icon: mdi:mushroom
    icon_color: red
card_mod:
  style:
    mushroom-template-chip:nth-child(1)$: |
      ha-state-icon {
        --color: var(--state-icon-color) !important;
      }