Proof of concept
No support given - if you don't know how to get this to work, that is probably a good thing for now.
resources:
- url: /local/slider-entity-row.js
type: js
views:
title: My view
cards:
- type: entities
entities:
- entity: light.my_lamp
name: A dimmable lamp
type: custom:slider-entity-row
hide_toggle: true - Remove toggle
break_slider: true - Put slider on separate row
hide_when_off: true - Hide the slider when the light is off
show_value: true - Show the current dimmer value instead of toggle.