Interesting! If I get it right, the API is in the spirit of Observable Plot (https://observablehq.com/plot/), less ggplot2.

In any case, I'm curious whether aes is necessary, or whether it would suffice to drop this function entirely and just use keys in the mapping (similarly for labs). Or, more broadly, whether using patterns from other implementations of the Grammar of Graphics is a conscious decision, or some sort of legacy baggage.