True padstacks have been on the horizon for KiCad for quite some time, but not implemented (yet)
Until then, I’m with eelik. In KiCad it is very common to make complicated pads out of multiple pads with the same pin number. This is used extensively for example in Footprints that have thermal via’s.
You can also look at it in the 3D viewer. if you of the board body and mask layers, then the via’s an tracks are floating in thin air and you can look at internals of your PCB easily.