Hybrids (at least Toyota hybrids; unclear about other brands) don’t just use a smaller engine - it’s a much more efficient engine design. However, this design also requires performance compromises that are only acceptable because there’s an electric motor supplementing it.

Someone else already linked the Technology Connections video that covers it in much greater detail.

For a grocery store? How much time do you spend shopping??

Besides, it wouldn’t make sense at all in a public garage. Even if you were SEVERELY limited on watts you could deliver, you’re still better off delivering them at higher voltage to reduce loss.

Come to think of it, I’ve never once seen a public level 1 charger. But I bet there are some exposed outlets you could use, if you happen to live nearby and don’t mind parking there for a day or two.