I remember looking at this cap sense example I think it is very similar to what you are asking.
It has a bunch of leds in a doble slider config which is a nice feature to have more pads and a longer slider
Hey just to add something more recent and a very neat application of this,
if you get the psoc 4000s prototyping kit https://www.cypress.com/documentation/development-kitsboards/cy8ckit-145-40xx-psoc-4000s-capsense-prototyping-kit
has also leds underneath the pcb and it looks really good when lit.