Usage:

resources:
  url: /community_plugin/button-toolbar/button-toolbar.js
  type: module

Images:

Left button toolbar with services call, right one with service call and state of the sensor!

Lovelace:

- type: custom:button-toolbar
  aspect_ratio: 1/2 # Optional, Default: 1/1
  content:
    entity: light.bedroom
    image: /local/bedroom_light.png
    height: 60%
  toolbar:
    - type: service # This is toolbar item type
      name: Toggle
      icon: mdi:lamp
      service:
        name: light.toggle
        entity: light.bedroom
    - type: state
      entity: sensor.bedroom_humidity
      unit: % # Optional, Default: entity unit_of_measurement