I know for my wife's Bolt, when you buy a new one, installation of a lvl2 charging station in your home is free as long as it is a "standard" installation. The installer is coming next week.
Standard installation means space in your electrical panel, relatively easy path of wiring from panel to charging station location, and sufficient capacity to the house. IF something is non standard, Chevy covers first $1000.
Worst case (ie, something like having to dig a new line to your house from the transformer), it can run you about $5000 (or so I've seen online, but those might be horror stories).