You’d think they could have a connector which lined up fairly easily when storing them and building a new one. Have a standard 30kW supply which automatically plugs in, then powers an on ramp charger. Not every ramp/spec would need the electic, only cars that need charging.

Indeed this seems to be an available product:

https://www.ip2.co.jp/parking/kikaishiki/products/ev-chargin...

https://www.tokyo-gas.co.jp/news/topics/20220930-04.html

With this being a retrofit

https://www.mhi.com/jp/news/1101285025.html

So it just seems to be a commercial question of demand rather than a technical question of feasibility.